Question

x²-4+(x-2)²

Answer 1

Giải:

\(x^2-4+\left(x-2\right)^2\)

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

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

\(=\left(x-2\right)\left[\left(x+2\right)+\left(x-2\right)\right]\)

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

\(=\left(x-2\right).2x\)

Chúc bạn học tốt!!!

Answer 2

\(x^2−4+(x−2)2=(x−2)(x+2)+(x−2)2=(x−2)(x−2+x+2)=2x(x−2)\)