Question

select a suitable identity and find the following product (7d-9e)(7d-9e)

Answer 1

(7d-9e) (7d-9e)= (7d-9e) ^2
= 7d^2 + 9e^2 + 2*7d*9e
= 49d^2 + 81e^2 + 126de

Answer 2

above answer is the correct answer