Question

Thực hiện phép tính
(x-6).(x+6)-2x.(x+6)+(x+6)^2

Answer 1

\(\left(x-6\right)\left(x+6\right)-2x\left(x+6\right)+\left(x+6\right)^2=x^2-36-2x^2-12x+x^2+12x+36=0\)

Answer 2

Ta có: \(\left(x-6\right)\left(x+6\right)-2x\left(x+6\right)+\left(x+6\right)^2\)

\(=x^2-36-2x^2-12x+x^2+12x+36\)

=0