Question

find the value of (a+b)²- (a - b)² (a) 4ab B) 2ab (C) 4ab² d) 2 ab²​

Answer 1

Answer:

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