Question

(a+b)² -(a-b)² how is that the answer

Answer 1

Step-by-step explanation:

(a+b)² -(a-b)²

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

Answer 2

Answer : 4AB [You can write in capital or small letters, it doesn't matter]

Step - by - step explanation : [A + B]^2 - [A - B]^2 = [A^2 + 2AB + B^2] - [A^2 - 2AB + B^2]

= A^2 + 2AB + B^2 -A^2 + 2AB - B^2

= 4AB