Question

EXERCISE 8
1. If a = 2 and b = 3. find the value of
d) a + b
(i) a' + ab
(iv) 2a - 3b
(v) 5a? - Zab​

Answer 1

Answer:

(i) x increased by 12 is (x+12).

(ii) y decreased by 7 is (y-7).

(iii) The difference of a and b, when a>b is (a-b).

(iv) The product of x and y is xy.

The sum of x and y is (x+y).

So, product of x and y added to their sum is xy+(x+y).

(v) One third of x is x3.

The sum of a and b is (a+b).

∴ One-third of x multiplied by the sum of a and b = x3×(a+b)=x(a+b)3

(vi) 5 times x added to 7 times y = (5×x)+(7×y), which is equal to 5x+7y.

Answer 2

Answer

d) a + b = 2+3= 5

i) a' + ab = 2' + 2×3= 8

iv) 2a - 3b = 2×2 - 3×3 = -5

v) 5a? - Zab = .....