Question

Phân tích đa thức thành nhân tử:

5x (x + 2y) + 15x² (x + 2y)

Answer 1

\(=\left(x+2y\right)\left(5x+15x^2\right)=5x\left(3x+1\right)\left(x+2y\right)\)

Answer 2

\(=\left(x+2y\right)\left(5x+15x^2\right)\\ =5x\left(x+2y\right)\left(1+3x\right)\)

Answer 3

\(5x\left(x+2y\right)+15x^2\left(x+2y\right)=\left(5x+15x^2\right)\left(x+2y\right)=5x\left(1+3x\right)\left(x+2y\right)\)