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All questions of Algebraic Expressions & Identities for Class 8 Exam
What is the degree of the polynomial?
- a)1
- b)2
- c)3
- d)4
Correct answer is option 'D'. Can you explain this answer?
What is the degree of the polynomial?
a)
1
b)
2
c)
3
d)
4
 | Ananya Das answered |
Degree of the polynomial = Highest power of x = 4
What is the H.C.F. of 11abc3, 13a2 b2 c and 17ab3 c2 ?- a)abc
- b)ab2c
- c)a2bc
- d)3abc
Correct answer is option 'A'. Can you explain this answer?
What is the H.C.F. of 11abc3, 13a2 b2 c and 17ab3 c2 ?
a)
abc
b)
ab2c
c)
a2bc
d)
3abc
 | Kavya Saxena answered |
H.C.F. of 11abc3, 13a2b2c, 17ab3c2 = abc
The perimeter of a triangle is 6m2 – 4m + 9 and two of the sides are m2 – 2m + 1 and 2m2 + 3m + 5. What is the third side?- a)3m2 – 5m + 3
- b)3m2 + 5m – 4
- c)5m2 – 3m + 5
- d)5m2 – 3m + 3
Correct answer is option 'A'. Can you explain this answer?
The perimeter of a triangle is 6m2 – 4m + 9 and two of the sides are m2 – 2m + 1 and 2m2 + 3m + 5. What is the third side?
a)
3m2 – 5m + 3
b)
3m2 + 5m – 4
c)
5m2 – 3m + 5
d)
5m2 – 3m + 3
| | Kavya Saxena answered |
Third side = 6m2 – 4m + 9 – (m2 – 2m + 1 + 2m2 + 3m + 5)
then what is the value of 
= 
what is the value of
?
If x + y = 10 and xy = 9, what is the value of x2 – y2?- a)40
- b)60
- c)80
- d)90
Correct answer is option 'C'. Can you explain this answer?
If x + y = 10 and xy = 9, what is the value of x2 – y2?
a)
40
b)
60
c)
80
d)
90
 | Pooja Shah answered |
( x + y) 2 = x2 + y2+ 2xy
∴
∴
What is the numerical coefficient in the product of 2abc, - 16a2bc and 3ab2c2?- a)64
- b)96
- c)-96
- d)-64
Correct answer is option 'C'. Can you explain this answer?
What is the numerical coefficient in the product of 2abc, - 16a2bc and 3ab2c2?
a)
64
b)
96
c)
-96
d)
-64
| | Nitish Kumar answered |
In the above question,
we only find the product of the numerical value as per he instructions above
so, 2 ×(-16) × 3
= -32 × 3
= - 96
we only find the product of the numerical value as per he instructions above
so, 2 ×(-16) × 3
= -32 × 3
= - 96
then what is the value of 
then what is the value of 
What are the factors of the expression ab – a - b + 1?- a)(a – 1) (b – 1)
- b)(1 - a) (b – 1)
- c)(a – 1) (1 – b)
- d)(1 – a) (1 – b)
Correct answer is option 'A'. Can you explain this answer?
What are the factors of the expression ab – a - b + 1?
a)
(a – 1) (b – 1)
b)
(1 - a) (b – 1)
c)
(a – 1) (1 – b)
d)
(1 – a) (1 – b)
 | Saikat Kumar answered |
ab – a – b + 1
= a(b – 1) – 1 (b – 1) = (b – 1) (a – 1)
= a(b – 1) – 1 (b – 1) = (b – 1) (a – 1)
If x + y = 12 and xy = 14 then what is the value of x2 + y2?- a)116
- b)114
- c)112
- d)118
Correct answer is option 'A'. Can you explain this answer?
If x + y = 12 and xy = 14 then what is the value of x2 + y2?
a)
116
b)
114
c)
112
d)
118
 | Saptarshi Chavan answered |
(x + y)2 = x2 + y2 + 2xy
= 116
= 116
then find the value of 
.
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