Question

Ptích đa thức thành ntử : 2x²+7x-9 ???

                                         x⁵-x³-x²+1

Answer 1

`2x^2+7x-9`

`=2x^2+9x-2x-9`

`=x(2x+9)-(2x+9)`

`=(2x+9)(x-1)`

Answer 2

X = \(-4\dfrac{1}{2}\) 

\(X=1\) 

Answer 3

\(2x^2+9x-2x-9=\left(2x^2-2x\right)+\left(9x-9\right)=2x\left(x-1\right)+9\left(x-1\right)=\left(x-1\right)\left(2x+9\right)\)

Answer 4

\(1,\\ =2x^2+9x-2x-9\\ =x\left(2x+9\right)-\left(2x+9\right)\\ =\left(x-1\right)\left(2x+9\right)\\ 2,\\ =x^3\left(x^2-1\right)-\left(x^2-1\right)\\ =\left(x^3-1\right)\left(x^2-1\right)\\ =\left(x-1\right)\left(x^2+x+1\right)\left(x-1\right)\left(x+1\right)\\ =\left(x-1\right)\left(x^2+x+1+x+1\right)\\ =\left(x-1\right)\left(x^2+2x+2\right)\)