\(x^3-9x^2+14x\)
\(=x\left(x^2-9x+14\right)\)
\(=x\left(x^2-2x-7x+14\right)\)
\(=x\left[\left(x^2-2x\right)-\left(7x-14\right)\right]\)
\(=x\left[x\left(x-2\right)-7\left(x-2\right)\right]\)
\(=x\left(x-2\right)\left(x-7\right)\)
Chúc bn học tốt
Đúng 0
Bình luận (2)
\(x^3-9x^2+14x\)
= \(x.x^2-\left(3x\right)^2+14x\)
=\(x.\left(x+3x\right).\left(x-3x\right)+14x\)
= \(x.\left(14+1\right).\left(x+3x\right).\left(x-3x\right)\)
Đúng 0
Bình luận (2)
