Question

Find product of {2x +(a+b)} {2x-(a+b)}​

Answer 1

$({2x +(a+b)}) \: ( {2x-(a+b)}) \\ = {(2x)}^{2} - (a + b) {}^{2} \\ = 4 {x}^{2} - ({a}^{2} + {b}^{2} + 2ab) \\ = 4x {}^{2} - {a}^{2} - {b}^{2} - 2ab$