## ML Aggarwal Class 7 Solutions for ICSE Maths Chapter 8 Algebraic Expressions Ex 8.3

Question 1.

If m = 2, find the value of:

(i) 3m – 5

(ii) 9 – 5m

(iii) 3m^{2} – 2m – 1

(iv) m – 4

Solution:

Question 2.

If p = -2, find the value of:

(1) 4p + 7

(ii) -3p^{2} + 4p + 7

(iii) -2p^{3} – 3p^{2} + 4p + 7

Solution:

Question 3.

If a = 2, b = -2, find the value of:

(i) a^{2} + b^{2}

(ii) a^{2} + ab + b^{2}

(iii) a^{2} – b^{2}

Solution:

Question 4.

When a = 0, b = -1, find the value of the given expressions:

(i) 2a^{2} + b^{2} + 1

(ii) a^{2} + ab + 2

(iii) 2a^{2}b + 2ab^{2} + ab

Solution:

Question 5.

If p = -10, find the value of p^{2} – 2p – 100.

Solution:

Question 6.

If z = 10, find the value of z^{3} – 3(z – 10).

Solution:

Question 7.

Simplify the following expressions and find their values when x = 2:

(i) x + 7 + 4(x – 5)

(ii) 3(x + 2) + 5x – 7

(iii) 6x + 5(x – 2)

(iv) 4(2x – 1) + 3x + 11

Solution:

Question 8.

Simplify the following expressions and find their values when a = -1, b = -2:

(i) 2a – 2b – 4 – 5 + a

(ii) 2(a^{2} + ab) + 3 – ab

Solution:

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