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Page 1 Exercise 6.1 Page No: 6.12 1. Find the values of each of the following: (i) 13 2 (ii) 7 3 (iii) 3 4 Solution: (i) Given 13 2 13 2 = 13 × 13 =169 (ii) Given 7 3 7 3 = 7 × 7 × 7 = 343 (iii) Given 3 4 3 4 = 3 × 3 × 3 × 3 = 81 2. Find the value of each of the following: (i) (-7) 2 (ii) (-3) 4 (iii) (-5) 5 Solution: (i) Given (-7) 2 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-7) 2 = (-7) × (-7) = 49 (ii) Given (-3) 4 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-3) 4 = (-3) × (-3) × (-3) × (-3) = 81 (iii) Given (-5) 5 Page 2 Exercise 6.1 Page No: 6.12 1. Find the values of each of the following: (i) 13 2 (ii) 7 3 (iii) 3 4 Solution: (i) Given 13 2 13 2 = 13 × 13 =169 (ii) Given 7 3 7 3 = 7 × 7 × 7 = 343 (iii) Given 3 4 3 4 = 3 × 3 × 3 × 3 = 81 2. Find the value of each of the following: (i) (-7) 2 (ii) (-3) 4 (iii) (-5) 5 Solution: (i) Given (-7) 2 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-7) 2 = (-7) × (-7) = 49 (ii) Given (-3) 4 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-3) 4 = (-3) × (-3) × (-3) × (-3) = 81 (iii) Given (-5) 5 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-5) 5 = (-5) × (-5) × (-5) × (-5) × (-5) = -3125 3. Simplify: (i) 3 × 10 2 (ii) 2 2 × 5 3 (iii) 3 3 × 5 2 Solution: (i) Given 3 × 10 2 3 × 10 2 = 3 × 10 × 10 = 3 × 100 = 300 (ii) Given 2 2 × 5 3 2 2 × 5 3 = 2 × 2 × 5 × 5 × 5 = 4 × 125 = 500 (iii) Given 3 3 × 5 2 3 3 × 5 2 = 3 × 3 × 3 × 5 × 5 = 27 × 25 = 675 4. Simply: (i) 3 2 × 10 4 (ii) 2 4 × 3 2 (iii) 5 2 × 3 4 Solution: (i) Given 3 2 × 10 4 3 2 × 10 4 = 3 × 3 × 10 × 10 × 10 × 10 = 9 × 10000 = 90000 Page 3 Exercise 6.1 Page No: 6.12 1. Find the values of each of the following: (i) 13 2 (ii) 7 3 (iii) 3 4 Solution: (i) Given 13 2 13 2 = 13 × 13 =169 (ii) Given 7 3 7 3 = 7 × 7 × 7 = 343 (iii) Given 3 4 3 4 = 3 × 3 × 3 × 3 = 81 2. Find the value of each of the following: (i) (-7) 2 (ii) (-3) 4 (iii) (-5) 5 Solution: (i) Given (-7) 2 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-7) 2 = (-7) × (-7) = 49 (ii) Given (-3) 4 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-3) 4 = (-3) × (-3) × (-3) × (-3) = 81 (iii) Given (-5) 5 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-5) 5 = (-5) × (-5) × (-5) × (-5) × (-5) = -3125 3. Simplify: (i) 3 × 10 2 (ii) 2 2 × 5 3 (iii) 3 3 × 5 2 Solution: (i) Given 3 × 10 2 3 × 10 2 = 3 × 10 × 10 = 3 × 100 = 300 (ii) Given 2 2 × 5 3 2 2 × 5 3 = 2 × 2 × 5 × 5 × 5 = 4 × 125 = 500 (iii) Given 3 3 × 5 2 3 3 × 5 2 = 3 × 3 × 3 × 5 × 5 = 27 × 25 = 675 4. Simply: (i) 3 2 × 10 4 (ii) 2 4 × 3 2 (iii) 5 2 × 3 4 Solution: (i) Given 3 2 × 10 4 3 2 × 10 4 = 3 × 3 × 10 × 10 × 10 × 10 = 9 × 10000 = 90000 (ii) Given2 4 × 3 2 2 4 × 3 2 = 2 × 2 × 2 × 2 × 3 × 3 = 16 × 9 = 144 (iii) Given 5 2 × 3 4 5 2 × 3 4 = 5 × 5 × 3 × 3 × 3 × 3 = 25 × 81 = 2025 5. Simplify: (i) (-2) × (-3) 3 (ii) (-3) 2 × (-5) 3 (iii) (-2) 5 × (-10) 2 Solution: (i) Given (-2) × (-3) 3 (-2) × (-3) 3 = (-2) × (-3) × (-3) × (-3) = (-2) × (-27) = 54 (ii) Given (-3) 2 × (-5) 3 (-3) 2 × (-5) 3 = (-3) × (-3) × (-5) × (-5) × (-5) = 9 × (-125) = -1125 (iii) Given (-2) 5 × (-10) 2 (-2) 5 × (-10) 2 = (-2) × (-2) × (-2) × (-2) × (-2) × (-10) × (-10) = (-32) × 100 = -3200 6. Simplify: (i) (3/4) 2 (ii) (-2/3) 4 (iii) (-4/5) 5 Solution: Page 4 Exercise 6.1 Page No: 6.12 1. Find the values of each of the following: (i) 13 2 (ii) 7 3 (iii) 3 4 Solution: (i) Given 13 2 13 2 = 13 × 13 =169 (ii) Given 7 3 7 3 = 7 × 7 × 7 = 343 (iii) Given 3 4 3 4 = 3 × 3 × 3 × 3 = 81 2. Find the value of each of the following: (i) (-7) 2 (ii) (-3) 4 (iii) (-5) 5 Solution: (i) Given (-7) 2 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-7) 2 = (-7) × (-7) = 49 (ii) Given (-3) 4 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-3) 4 = (-3) × (-3) × (-3) × (-3) = 81 (iii) Given (-5) 5 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-5) 5 = (-5) × (-5) × (-5) × (-5) × (-5) = -3125 3. Simplify: (i) 3 × 10 2 (ii) 2 2 × 5 3 (iii) 3 3 × 5 2 Solution: (i) Given 3 × 10 2 3 × 10 2 = 3 × 10 × 10 = 3 × 100 = 300 (ii) Given 2 2 × 5 3 2 2 × 5 3 = 2 × 2 × 5 × 5 × 5 = 4 × 125 = 500 (iii) Given 3 3 × 5 2 3 3 × 5 2 = 3 × 3 × 3 × 5 × 5 = 27 × 25 = 675 4. Simply: (i) 3 2 × 10 4 (ii) 2 4 × 3 2 (iii) 5 2 × 3 4 Solution: (i) Given 3 2 × 10 4 3 2 × 10 4 = 3 × 3 × 10 × 10 × 10 × 10 = 9 × 10000 = 90000 (ii) Given2 4 × 3 2 2 4 × 3 2 = 2 × 2 × 2 × 2 × 3 × 3 = 16 × 9 = 144 (iii) Given 5 2 × 3 4 5 2 × 3 4 = 5 × 5 × 3 × 3 × 3 × 3 = 25 × 81 = 2025 5. Simplify: (i) (-2) × (-3) 3 (ii) (-3) 2 × (-5) 3 (iii) (-2) 5 × (-10) 2 Solution: (i) Given (-2) × (-3) 3 (-2) × (-3) 3 = (-2) × (-3) × (-3) × (-3) = (-2) × (-27) = 54 (ii) Given (-3) 2 × (-5) 3 (-3) 2 × (-5) 3 = (-3) × (-3) × (-5) × (-5) × (-5) = 9 × (-125) = -1125 (iii) Given (-2) 5 × (-10) 2 (-2) 5 × (-10) 2 = (-2) × (-2) × (-2) × (-2) × (-2) × (-10) × (-10) = (-32) × 100 = -3200 6. Simplify: (i) (3/4) 2 (ii) (-2/3) 4 (iii) (-4/5) 5 Solution: (i) Given (3/4) 2 (3/4) 2 = (3/4) × (3/4) = (9/16) (ii) Given (-2/3) 4 (-2/3) 4 = (-2/3) × (-2/3) × (-2/3) × (-2/3) = (16/81) (iii) Given (-4/5) 5 (-4/5) 5 = (-4/5) × (-4/5) × (-4/5) × (-4/5) × (-4/5) = (-1024/3125) 7. Identify the greater number in each of the following: (i) 2 5 or 5 2 (ii) 3 4 or 4 3 (iii) 3 5 or 5 3 Solution: (i) Given 2 5 or 5 2 2 5 = 2 × 2 × 2 × 2 × 2 = 32 5 2 = 5 × 5 = 25 Therefore, 2 5 > 5 2 (ii) Given 3 4 or 4 3 3 4 = 3 × 3 × 3 × 3 = 81 4 3 = 4 × 4 × 4 = 64 Therefore, 3 4 > 4 3 (iii) Given 3 5 or 5 3 3 5 = 3 × 3 × 3 × 3 × 3 = 243 5 3 = 5 × 5 × 5 = 125 Page 5 Exercise 6.1 Page No: 6.12 1. Find the values of each of the following: (i) 13 2 (ii) 7 3 (iii) 3 4 Solution: (i) Given 13 2 13 2 = 13 × 13 =169 (ii) Given 7 3 7 3 = 7 × 7 × 7 = 343 (iii) Given 3 4 3 4 = 3 × 3 × 3 × 3 = 81 2. Find the value of each of the following: (i) (-7) 2 (ii) (-3) 4 (iii) (-5) 5 Solution: (i) Given (-7) 2 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-7) 2 = (-7) × (-7) = 49 (ii) Given (-3) 4 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-3) 4 = (-3) × (-3) × (-3) × (-3) = 81 (iii) Given (-5) 5 We know that (-a) even number = positive number (-a) odd number = negative number We have, (-5) 5 = (-5) × (-5) × (-5) × (-5) × (-5) = -3125 3. Simplify: (i) 3 × 10 2 (ii) 2 2 × 5 3 (iii) 3 3 × 5 2 Solution: (i) Given 3 × 10 2 3 × 10 2 = 3 × 10 × 10 = 3 × 100 = 300 (ii) Given 2 2 × 5 3 2 2 × 5 3 = 2 × 2 × 5 × 5 × 5 = 4 × 125 = 500 (iii) Given 3 3 × 5 2 3 3 × 5 2 = 3 × 3 × 3 × 5 × 5 = 27 × 25 = 675 4. Simply: (i) 3 2 × 10 4 (ii) 2 4 × 3 2 (iii) 5 2 × 3 4 Solution: (i) Given 3 2 × 10 4 3 2 × 10 4 = 3 × 3 × 10 × 10 × 10 × 10 = 9 × 10000 = 90000 (ii) Given2 4 × 3 2 2 4 × 3 2 = 2 × 2 × 2 × 2 × 3 × 3 = 16 × 9 = 144 (iii) Given 5 2 × 3 4 5 2 × 3 4 = 5 × 5 × 3 × 3 × 3 × 3 = 25 × 81 = 2025 5. Simplify: (i) (-2) × (-3) 3 (ii) (-3) 2 × (-5) 3 (iii) (-2) 5 × (-10) 2 Solution: (i) Given (-2) × (-3) 3 (-2) × (-3) 3 = (-2) × (-3) × (-3) × (-3) = (-2) × (-27) = 54 (ii) Given (-3) 2 × (-5) 3 (-3) 2 × (-5) 3 = (-3) × (-3) × (-5) × (-5) × (-5) = 9 × (-125) = -1125 (iii) Given (-2) 5 × (-10) 2 (-2) 5 × (-10) 2 = (-2) × (-2) × (-2) × (-2) × (-2) × (-10) × (-10) = (-32) × 100 = -3200 6. Simplify: (i) (3/4) 2 (ii) (-2/3) 4 (iii) (-4/5) 5 Solution: (i) Given (3/4) 2 (3/4) 2 = (3/4) × (3/4) = (9/16) (ii) Given (-2/3) 4 (-2/3) 4 = (-2/3) × (-2/3) × (-2/3) × (-2/3) = (16/81) (iii) Given (-4/5) 5 (-4/5) 5 = (-4/5) × (-4/5) × (-4/5) × (-4/5) × (-4/5) = (-1024/3125) 7. Identify the greater number in each of the following: (i) 2 5 or 5 2 (ii) 3 4 or 4 3 (iii) 3 5 or 5 3 Solution: (i) Given 2 5 or 5 2 2 5 = 2 × 2 × 2 × 2 × 2 = 32 5 2 = 5 × 5 = 25 Therefore, 2 5 > 5 2 (ii) Given 3 4 or 4 3 3 4 = 3 × 3 × 3 × 3 = 81 4 3 = 4 × 4 × 4 = 64 Therefore, 3 4 > 4 3 (iii) Given 3 5 or 5 3 3 5 = 3 × 3 × 3 × 3 × 3 = 243 5 3 = 5 × 5 × 5 = 125 Therefore, 3 5 > 5 3 8. Express each of the following in exponential form: (i) (-5) × (-5) × (-5) (ii) (-5/7) × (-5/7) × (-5/7) × (-5/7) (iii) (4/3) × (4/3) × (4/3) × (4/3) × (4/3) Solution: (i) Given (-5) × (-5) × (-5) Exponential form of (-5) × (-5) × (-5) = (-5) 3 (ii) Given (-5/7) × (-5/7) × (-5/7) × (-5/7) Exponential form of (-5/7) × (-5/7) × (-5/7) × (-5/7) = (-5/7) 4 (iii) Given (4/3) × (4/3) × (4/3) × (4/3) × (4/3) Exponential form of (4/3) × (4/3) × (4/3) × (4/3) × (4/3) = (4/3) 5 9. Express each of the following in exponential form: (i) x × x × x × x × a × a × b × b × b (ii) (-2) × (-2) × (-2) × (-2) × a × a × a (iii) (-2/3) × (-2/3) × x × x × x Solution: (i) Given x × x × x × x × a × a × b × b × b Exponential form of x × x × x × x × a × a × b × b × b = x 4 a 2 b 3 (ii) Given (-2) × (-2) × (-2) × (-2) × a × a × a Exponential form of (-2) × (-2) × (-2) × (-2) × a × a × a = (-2) 4 a 3 (iii) Given (-2/3) × (-2/3) × x × x × x Exponential form of (-2/3) × (-2/3) × x × x × x = (-2/3) 2 x 3 10. Express each of the following numbers in exponential form: (i) 512 (ii) 625 (iii) 729 Solution:Read More
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