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Page 2 Q u e s t i o n : 2 5 Find the product: (7x + 2y) × (x + 4y) S o l u t i o n : By horizontal method: 7x +2y × x +4y = 7x x +4y +2y x +4y = 7x 2 +28xy +2xy +8y 2 = 7x 2 +30xy +8y 2 Q u e s t i o n : 2 6 Find the product: (9x + 5y) × (4x + 3y) S o l u t i o n : By horizontal method: 9x +5y × 4x +3y 9x 4x +3y +5y 4x +3y = 36x 2 +27xy +20xy +15y 2 = 36x 2 +47xy +15y 2 Q u e s t i o n : 2 7 Find the product: (3m - 4n) × (2m - 3n) S o l u t i o n : By horizontal method: 3m -4n × 2m -3n = 3m 2m -3n -4n 2m -3n = 6m 2 -9mn -8mn +12n 2 = 6m 2 -17mn +12n 2 Q u e s t i o n : 2 8 Find the product: (x 2 - a 2 ) × (x - a) S o l u t i o n : By horizontal method: x 2 -a 2 × x -a = x 2 x -a -a 2 x -a = x 3 -ax 2 -a 2 x +a 3 i.e x 3 +a 3 -ax x -a Q u e s t i o n : 2 9 Find the product: (x 2 - y 2 ) × (x + 2y) S o l u t i o n : By horizontal method: x 2 -y 2 × x +2y = x 2 x +2y -y 2 x +2y = x 3 +2x 2 y -xy 2 -2y 3 i. e x 3 -2y 3 +xy 2x -y Q u e s t i o n : 3 0 Find the product: (3p 2 + q 2 ) × (2p 2 - 3q 2 ) S o l u t i o n : By horizontal method: 3p 2 +q 2 × 2p 2 -3q 2 = 3p 2 2p 2 -3q 2 +q 2 2p 2 -3q 2 = 6p 4 -9p 2 q 2 +2p 2 q 2 -3q 4 i. e6p 4 -7p 2 q 2 -3q 4 Q u e s t i o n : 3 1 Find the product: (2x 2 - 5y 2 ) × (x 2 + 3y 2 ) S o l u t i o n : By horizontal method: 2x 2 -5y 2 × x 2 +3y 2 = 2x 2 x 2 +3y 2 -5y 2 x 2 +3y 2 = 2x 4 +6x 2 y 2 -5x 2 y 2 -15y 4 = 2x 4 +x 2 y 2 -15y 4 Q u e s t i o n : 3 2 Find the product: (x 3 - y 3 ) × (x 2 + y 2 ) S o l u t i o n : By horizontal method: x 3 -y 3 × x 2 +y 2 = x 3 x 2 +y 2 -y 3 x 2 +y 2 = x 5 +x 3 y 2 -x 2 y 3 -y 5 = x 5 -y 5 +x 2 y 2 (x -y) Q u e s t i o n : 3 3 Find the product: (x 4 + y 4 ) × (x 2 - y 2 ) S o l u t i o n : By horizontal method: x 4 +y 4 × x 2 -y 2 = x 4 x 2 -y 2 +y 4 x 2 -y 2 = x 6 -x 4 y 2 +y 4 x 2 -y 6 = x 6 -y 6 -x 2 y 2 x 2 -y 2 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) Page 3 Q u e s t i o n : 2 5 Find the product: (7x + 2y) × (x + 4y) S o l u t i o n : By horizontal method: 7x +2y × x +4y = 7x x +4y +2y x +4y = 7x 2 +28xy +2xy +8y 2 = 7x 2 +30xy +8y 2 Q u e s t i o n : 2 6 Find the product: (9x + 5y) × (4x + 3y) S o l u t i o n : By horizontal method: 9x +5y × 4x +3y 9x 4x +3y +5y 4x +3y = 36x 2 +27xy +20xy +15y 2 = 36x 2 +47xy +15y 2 Q u e s t i o n : 2 7 Find the product: (3m - 4n) × (2m - 3n) S o l u t i o n : By horizontal method: 3m -4n × 2m -3n = 3m 2m -3n -4n 2m -3n = 6m 2 -9mn -8mn +12n 2 = 6m 2 -17mn +12n 2 Q u e s t i o n : 2 8 Find the product: (x 2 - a 2 ) × (x - a) S o l u t i o n : By horizontal method: x 2 -a 2 × x -a = x 2 x -a -a 2 x -a = x 3 -ax 2 -a 2 x +a 3 i.e x 3 +a 3 -ax x -a Q u e s t i o n : 2 9 Find the product: (x 2 - y 2 ) × (x + 2y) S o l u t i o n : By horizontal method: x 2 -y 2 × x +2y = x 2 x +2y -y 2 x +2y = x 3 +2x 2 y -xy 2 -2y 3 i. e x 3 -2y 3 +xy 2x -y Q u e s t i o n : 3 0 Find the product: (3p 2 + q 2 ) × (2p 2 - 3q 2 ) S o l u t i o n : By horizontal method: 3p 2 +q 2 × 2p 2 -3q 2 = 3p 2 2p 2 -3q 2 +q 2 2p 2 -3q 2 = 6p 4 -9p 2 q 2 +2p 2 q 2 -3q 4 i. e6p 4 -7p 2 q 2 -3q 4 Q u e s t i o n : 3 1 Find the product: (2x 2 - 5y 2 ) × (x 2 + 3y 2 ) S o l u t i o n : By horizontal method: 2x 2 -5y 2 × x 2 +3y 2 = 2x 2 x 2 +3y 2 -5y 2 x 2 +3y 2 = 2x 4 +6x 2 y 2 -5x 2 y 2 -15y 4 = 2x 4 +x 2 y 2 -15y 4 Q u e s t i o n : 3 2 Find the product: (x 3 - y 3 ) × (x 2 + y 2 ) S o l u t i o n : By horizontal method: x 3 -y 3 × x 2 +y 2 = x 3 x 2 +y 2 -y 3 x 2 +y 2 = x 5 +x 3 y 2 -x 2 y 3 -y 5 = x 5 -y 5 +x 2 y 2 (x -y) Q u e s t i o n : 3 3 Find the product: (x 4 + y 4 ) × (x 2 - y 2 ) S o l u t i o n : By horizontal method: x 4 +y 4 × x 2 -y 2 = x 4 x 2 -y 2 +y 4 x 2 -y 2 = x 6 -x 4 y 2 +y 4 x 2 -y 6 = x 6 -y 6 -x 2 y 2 x 2 -y 2 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) Q u e s t i o n : 3 4 Find the product: x 4 + 1 x 4 × x + 1 x S o l u t i o n : By horizontal method: x 4 + 1 x 4 × x + 1 x = x 4 x + 1 x + 1 x 4 x + 1 x = x 5 +x 3 + 1 x 3 + 1 x 5 i. e x 3 x 2 +1 + 1 x 3 1 + 1 x 2 Q u e s t i o n : 3 5 Find the product: (x 2 - 3x + 7) × 2x +3 S o l u t i o n : By horizontal method: x 2 -3x +7 × 2x +3 = 2x x 2 -3x +7 +3 x 2 -3x +7 = 2x 3 -6x 2 +14x +3x 2 -9x +21 = 2x 3 -3x 2 +5x +21 Q u e s t i o n : 3 6 Find the product: (3x 2 + 5x - 9) × (3x - 5) S o l u t i o n : By horizontal method: 3x 2 +5x -9 × 3x -5 = 3x 3x 2 +5x -9 -5 3x 2 +5x -9 = 9x 3 +15x 2 -27x -15x 2 -25x +45 = 9x 3 -52x +45 Q u e s t i o n : 3 7 Find the product: (x 2 - xy + y 2 ) × (x + y) S o l u t i o n : By horizontal method: x 2 -xy +y 2 × x +y = x x 2 -xy +y 2 +y x 2 -xy +y 2 = x 3 -x 2 y +y 2 x +x 2 y -xy 2 +y 3 = x 3 +y 3 Q u e s t i o n : 3 8 Find the product: (x 2 + xy + y 2 ) × (x - y) S o l u t i o n : By horizontal method: x 2 +xy +y 2 × x -y x x 2 +xy +y 2 -y x 2 +xy +y 2 = x 3 +x 2 y +xy 2 -x 2 y -xy 2 -y 3 = x 3 -y 3 Q u e s t i o n : 3 9 Find the product: (x 3 - 2x 2 + 5) × (4x - 1) S o l u t i o n : By horizontal method: x 3 -2x 2 +5 × 4x -1 = 4x x 3 -2x 2 +5 -1 x 3 -2x 2 +5 = 4x 4 -8x 3 +20x -x 3 +2x 2 -5 = 4x 4 -9x 3 +2x 2 +20x -5 Q u e s t i o n : 4 0 Find the product: (9x 2 - x + 15) × (x 2 - 3) S o l u t i o n : By horizontal method: 9x 2 -x +15 × x 2 -3 = x 2 9x 2 -x +15 -3 9x 2 -x +15 = 9x 4 -x 3 +15x 2 -27x 2 +3x -45 = 9x 4 -x 3 -12x 2 +3x -45 Q u e s t i o n : 4 1 Find the product: (x 2 - 5x + 8) × (x 2 + 2) S o l u t i o n : By horizontal method: x 2 -5x +8 × x 2 +2 = x 2 x 2 -5x +8 +2 x 2 -5x +8 = x 4 -5x 3 +8x 2 +2x 2 -10x +16 = x 4 -5x 3 +10x 2 -10x +16 Q u e s t i o n : 4 2 Find the product: (x 3 - 5x 2 + 3x + 1) × (x 3 - 3) S o l u t i o n : By horizontal method: x 3 -5x 2 +3x +1 × x 2 -3 = x 2 x 3 -5x 2 +3x +1 -3 x 3 -5x 2 +3x +1 = x 5 -5x 4 +3x 3 +x 2 -3x 3 +15x 2 -9x -3 = x 5 -5x 4 +16x 2 -9x -3 Q u e s t i o n : 4 3 Find the product: ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) Page 4 Q u e s t i o n : 2 5 Find the product: (7x + 2y) × (x + 4y) S o l u t i o n : By horizontal method: 7x +2y × x +4y = 7x x +4y +2y x +4y = 7x 2 +28xy +2xy +8y 2 = 7x 2 +30xy +8y 2 Q u e s t i o n : 2 6 Find the product: (9x + 5y) × (4x + 3y) S o l u t i o n : By horizontal method: 9x +5y × 4x +3y 9x 4x +3y +5y 4x +3y = 36x 2 +27xy +20xy +15y 2 = 36x 2 +47xy +15y 2 Q u e s t i o n : 2 7 Find the product: (3m - 4n) × (2m - 3n) S o l u t i o n : By horizontal method: 3m -4n × 2m -3n = 3m 2m -3n -4n 2m -3n = 6m 2 -9mn -8mn +12n 2 = 6m 2 -17mn +12n 2 Q u e s t i o n : 2 8 Find the product: (x 2 - a 2 ) × (x - a) S o l u t i o n : By horizontal method: x 2 -a 2 × x -a = x 2 x -a -a 2 x -a = x 3 -ax 2 -a 2 x +a 3 i.e x 3 +a 3 -ax x -a Q u e s t i o n : 2 9 Find the product: (x 2 - y 2 ) × (x + 2y) S o l u t i o n : By horizontal method: x 2 -y 2 × x +2y = x 2 x +2y -y 2 x +2y = x 3 +2x 2 y -xy 2 -2y 3 i. e x 3 -2y 3 +xy 2x -y Q u e s t i o n : 3 0 Find the product: (3p 2 + q 2 ) × (2p 2 - 3q 2 ) S o l u t i o n : By horizontal method: 3p 2 +q 2 × 2p 2 -3q 2 = 3p 2 2p 2 -3q 2 +q 2 2p 2 -3q 2 = 6p 4 -9p 2 q 2 +2p 2 q 2 -3q 4 i. e6p 4 -7p 2 q 2 -3q 4 Q u e s t i o n : 3 1 Find the product: (2x 2 - 5y 2 ) × (x 2 + 3y 2 ) S o l u t i o n : By horizontal method: 2x 2 -5y 2 × x 2 +3y 2 = 2x 2 x 2 +3y 2 -5y 2 x 2 +3y 2 = 2x 4 +6x 2 y 2 -5x 2 y 2 -15y 4 = 2x 4 +x 2 y 2 -15y 4 Q u e s t i o n : 3 2 Find the product: (x 3 - y 3 ) × (x 2 + y 2 ) S o l u t i o n : By horizontal method: x 3 -y 3 × x 2 +y 2 = x 3 x 2 +y 2 -y 3 x 2 +y 2 = x 5 +x 3 y 2 -x 2 y 3 -y 5 = x 5 -y 5 +x 2 y 2 (x -y) Q u e s t i o n : 3 3 Find the product: (x 4 + y 4 ) × (x 2 - y 2 ) S o l u t i o n : By horizontal method: x 4 +y 4 × x 2 -y 2 = x 4 x 2 -y 2 +y 4 x 2 -y 2 = x 6 -x 4 y 2 +y 4 x 2 -y 6 = x 6 -y 6 -x 2 y 2 x 2 -y 2 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) Q u e s t i o n : 3 4 Find the product: x 4 + 1 x 4 × x + 1 x S o l u t i o n : By horizontal method: x 4 + 1 x 4 × x + 1 x = x 4 x + 1 x + 1 x 4 x + 1 x = x 5 +x 3 + 1 x 3 + 1 x 5 i. e x 3 x 2 +1 + 1 x 3 1 + 1 x 2 Q u e s t i o n : 3 5 Find the product: (x 2 - 3x + 7) × 2x +3 S o l u t i o n : By horizontal method: x 2 -3x +7 × 2x +3 = 2x x 2 -3x +7 +3 x 2 -3x +7 = 2x 3 -6x 2 +14x +3x 2 -9x +21 = 2x 3 -3x 2 +5x +21 Q u e s t i o n : 3 6 Find the product: (3x 2 + 5x - 9) × (3x - 5) S o l u t i o n : By horizontal method: 3x 2 +5x -9 × 3x -5 = 3x 3x 2 +5x -9 -5 3x 2 +5x -9 = 9x 3 +15x 2 -27x -15x 2 -25x +45 = 9x 3 -52x +45 Q u e s t i o n : 3 7 Find the product: (x 2 - xy + y 2 ) × (x + y) S o l u t i o n : By horizontal method: x 2 -xy +y 2 × x +y = x x 2 -xy +y 2 +y x 2 -xy +y 2 = x 3 -x 2 y +y 2 x +x 2 y -xy 2 +y 3 = x 3 +y 3 Q u e s t i o n : 3 8 Find the product: (x 2 + xy + y 2 ) × (x - y) S o l u t i o n : By horizontal method: x 2 +xy +y 2 × x -y x x 2 +xy +y 2 -y x 2 +xy +y 2 = x 3 +x 2 y +xy 2 -x 2 y -xy 2 -y 3 = x 3 -y 3 Q u e s t i o n : 3 9 Find the product: (x 3 - 2x 2 + 5) × (4x - 1) S o l u t i o n : By horizontal method: x 3 -2x 2 +5 × 4x -1 = 4x x 3 -2x 2 +5 -1 x 3 -2x 2 +5 = 4x 4 -8x 3 +20x -x 3 +2x 2 -5 = 4x 4 -9x 3 +2x 2 +20x -5 Q u e s t i o n : 4 0 Find the product: (9x 2 - x + 15) × (x 2 - 3) S o l u t i o n : By horizontal method: 9x 2 -x +15 × x 2 -3 = x 2 9x 2 -x +15 -3 9x 2 -x +15 = 9x 4 -x 3 +15x 2 -27x 2 +3x -45 = 9x 4 -x 3 -12x 2 +3x -45 Q u e s t i o n : 4 1 Find the product: (x 2 - 5x + 8) × (x 2 + 2) S o l u t i o n : By horizontal method: x 2 -5x +8 × x 2 +2 = x 2 x 2 -5x +8 +2 x 2 -5x +8 = x 4 -5x 3 +8x 2 +2x 2 -10x +16 = x 4 -5x 3 +10x 2 -10x +16 Q u e s t i o n : 4 2 Find the product: (x 3 - 5x 2 + 3x + 1) × (x 3 - 3) S o l u t i o n : By horizontal method: x 3 -5x 2 +3x +1 × x 2 -3 = x 2 x 3 -5x 2 +3x +1 -3 x 3 -5x 2 +3x +1 = x 5 -5x 4 +3x 3 +x 2 -3x 3 +15x 2 -9x -3 = x 5 -5x 4 +16x 2 -9x -3 Q u e s t i o n : 4 3 Find the product: ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) (3x + 2y - 4) × (x - y + 2) S o l u t i o n : By horizontal method: 3x +2y -4 × x -y +2 x 3x +2y -4 -y 3x +2y -4 +2 3x +2y -4 = 3x 2 +2xy -4x -3xy -2y 2 +4y +6x +4y -8 = 3x 2 -2y 2 -xy +2x +8y -8 Q u e s t i o n : 4 4 Find the product: (x 2 - 5x + 8) × (x 2 + 2x - 3) S o l u t i o n : By horizontal method: x 2 -5x +8 × x 2 +2x -3 = x 2 x 2 -5x +8 +2x x 2 -5x +8 -3 x 2 -5x +8 = x 4 -5x 3 +8x 2 +2x 3 -10x 2 +16x -3x 2 +15x -24 = x 4 -3x 3 -5x 2 +31x -24 Q u e s t i o n : 4 5 Find the product: (2x 2 + 3x - 7) × (3x 2 - 5x + 4) S o l u t i o n : By horizontal method: 2x 2 +3x -7 × 3x 2 -5x +4 = 2x 2 3x 2 -5x +4 +3x 3x 2 -5x +4 -7 3x 2 -5x +4 = 6x 4 -10x 3 +8x 2 +9x 3 -15x 2 +12x -21x 2 +35x -28 = 6x 4 -x 3 -28x 2 +47x -28 Q u e s t i o n : 4 6 Find the product: (9x 2 - x + 15) × (x 2 - x - 1) S o l u t i o n : By horizontal method: 9x 2 -x +15 × x 2 -x -1 = x 2 9x 2 -x +15 -x 9x 2 -x +15 -1 9x 2 -x +15 = 9x 4 -x 3 +15x 2 -9x 3 +x 2 -15x -9x 2 +x -15 = 9x 4 -10x 3 +7x 2 -14x -15 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( )Read More
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