Question

Rút gọn biểu thức:

\(\left(3a-2x\right)^2-\left(a-2x\right)^2\)

Answer 1

\(\left(3a-2x\right)^2-\left(a-2x\right)^2\)

\(=\left(3a-2x+a-2x\right)\left(3a-2x-a+2x\right)\)

\(=2a\left(4a-4x\right)\)

\(=8a\left(a-x\right)\)

Answer 2

\(\left(3a-2x\right)^2-\left(a-2x\right)^2=\left(3a-2x+a-2x\right)\left(3a-2x-a+2x\right)\)

\(=\left(4a-4x\right)2a\)

\(=8a.\left(a-x\right)\)