Question

(a) Evaluate using suitable identity : (9x - 7y)2​

Answer 1

Step-by-step explanation:

(9x-7y)2

2×9x+2×(-7y)

18x-14y

Answer 2

Answer:

$(9x - 7y)^{2} = (9x) ^{2} + (7y) ^{2} -2 \times 9x \times 7y \\ = 81x ^{2} + 49y ^{2} - 126xy$

or

= (9x) × 2 + 2 ×(-7y)

= 18x - 14y.

Step-by-step explanation:

Hope it helps.