# NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.3

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## NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.3

NCERT TEXTBOOK EXERCISES

Question 1. If m = 2, find the value of :

1. m – 2
2. 3m – 5
3. 9 – 5m
4. 3m2 – 2m – 7
5. 5m2 – 4

Solution:

Question 2. If p = – 2, find the value of :

1. 4p + 7
2. – 3p2 + 4p + 7
3. – 2p3 – 3p2 + 4p + 7.

Solution:

Question 3. Find the value of the following expressions, when x = – 1 :

1. 2x – 7
2. – x + 2
3. x2 + 2x + 1
4. 2x2 – x – 2.

Solution:

Question 4. If a = 2, b = – 2, find the value of :

1. a2 + b2
2. a2 + ab + b2
3. a2 – b2.

Solution:

Question 5. When a = 0, b = – 1, find the value of the given expressions :

1. 2a + 2b
2. 2a2 + b2 + 1
3. 2a2b + 2ab2 + ab
4. a2 + ab + 2.

Solution:

Question 6. Simplify the expressions and find the value ifx is equal to 2.

1. x + 7 + 4 (x – 5)
2. 3 (x + 2) + 5x – 7
3. 6x + 5 (x – 2)
4. 4 (2x – 1) + 3x + 11.

Solution:

Question 7. Simplify these expressions and find their values if x = 3, a = – 1, b = – 2.

1. 3x – 5 – x + 9
2. 2 – 8x + 4x + 4
3. 3a + 5 – 8a + 1
4. 10 – 3b – 4 – 5b
5. 2a – 2b – 4 – 5 + a.

Solution:

Question 8.
(i) If z = 10, find the value of z3 – 3(z – 10).
(ii) If p = -10, find the value of p2 – 2p – 100.

Solution:

Question 9. What should be the value of a if the value of 2x2 + x – a equals to 5, when x = 0 ?

Solution:

Question 10. Simplify the expression and find its value when a = 5 and b = – 3 2(a2 + ab) + 3 – ab.

Solution:

## NCERT Solutions for Class 7 Maths Chapter 12 Algebraic Expressions Ex 12.3 PDF

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