Question

evaluate the following using suitable identities
a) (7x-4)^2)
b) 102x105

Answer 1

Step-by-step explanation:

(a) (7x-4)^2)

= (7x)^2 - 2×7x × 4 + 4^2

= 49x^2 - 56x + 16

(b) 102 × 105

= (100+2)(100 + 5)

= 100^2 + (2+5)100 +(2×5)

= 100^2 + (2+5)100 + (2×5) =10000 + 700 + 10

= 10710