Question

(A-b)²=a²+2ab+b² solve it

Answer 1

(a - b)² = a² + 2ab + b²

Identity : (x - y)² = x² - 2xy + y²

Here, x = a, y = b

→ a² - 2ab + b² = a² + 2ab + b²

→ - 2ab = 2ab

→ 2ab + 2ab = 0

→ 4ab = 0

→ ab = 0/4

→ ab = 0

Answer 2

${a }^{2} + b {}^{2} - 2ab = {a}^{2} + {b}^{2} + 2ab$
$cancel \: {a}^{2} + {b}^{2} on \: both \: side$
=> Cancel 2on both sides

=> 2ab=0

=> ab=0