Question

Rút gọn:

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

 

Answer 1

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

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

`=-2b.2a=-4ab`

Answer 2

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

Answer 3

`= a^2-2ab + b^2 - a^2 - 2ab - b^2`

`= -4ab`