Question

(a+b)2-(a-b)2 then what's the answer of the quality

Answer 1

$\huge\green{Answer}$

$(a + b) {}^{2} - (a - b) {}^{2}$

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

$= {a}^{2} + {b}^{2} + 2ab - {a}^{2} - {b}^{2} + 2ab$

$= 4ab$