Question

`9x^2-4(y+2x)^(2)`

Answer 1

Explanation:

by identity a²-b² =(a-b)(a+b)

9x² = (3x)²

4(y+2x)² = 2²(y+2x)² = (2(y+2x))²=(2y+4x)²

so : a = 3x and b = 2y+4x

put a and b in this identity a²-b² =(a-b)(a+b) ....continu