Question

Thu gọn

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

Answer 1

\(\left(a-b\right)^2-\left(a+b\right)^2\)

\(=a^2-2ab+b^2-a^2-2ab-b^2\)

=-4ab

Answer 2

\(\left(a-b\right)^2-\left(a+b\right)^2=\left(a-b+a+b\right)\cdot\left(a-b-a-b\right)=-2b\cdot2a=-4ab\)

Answer 3

\(\left(a-b-a-b\right)\left(a-b+a+b\right)=-2b.2a\)

Answer 4

(a - b)² - (a + b)²

= (a - b + a + b)(a - b - a - b)

= 2a . (-2b)

= -4ab