Question

\(\left(x^3-2x^2\right)+\left(2x-4\right)-9\)

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

\(=\left(x-2\right)\left(x^2+2\right)-9\)

\(=\left[\sqrt{\left(x-2\right)\left(x^2+2\right)}\right]^2-3^2\)

\(=\left[\sqrt{\left(x-2\right)\left(x^2+2\right)}-3\right]\left[\sqrt{\left(x-2\right)\left(x^2+2\right)}+3\right]\)

Answer 1

làm tiếp à bạn;-;?

\(=\left[\sqrt{\left(x-2\right)\left(x^2+2\right)}\right]^2-9\)

\(=\left(x-2\right)\left(x^2+2\right)-9\)

\(=x^3+2x-2x^2-4-9\)

\(=x^3-2x^2+2x-13\)