Question

Phân tích thành nhân tử các đa thức sau:

\(x^2-16+2\left(x+4\right)\)

Answer 1

\(x^2-16+2\left(x+4\right)\)

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

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

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

Answer 2

\(x^2-16+2\left(x+4\right)=x^2+2x-8=x^2-2x+4x-8\)

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