\(2x^3-35x+75=2x^3+10x^2-10x^2-50x+15x+75\)
\(=\left(x+5\right)\left[2x^2-10x+15\right]\)
Trả lời:
Sửa đề: \(2x^2-35x+75\)
\(=2x^2-30x-5x+75\)
\(=\left(2x^2-30x\right)-\left(5x-75\right)\)
\(=2x\left(x-15\right)-5\left(x-15\right)\)
\(=\left(x-15\right)\left(2x-5\right)\)
2x^3-35x+75
= (x+5)(2x^2-10x+15)