Question

Phân tích đa thức thành nhân tử :

a, A= x³ - x² + 2

b, B= x³ + x² - 14x - 24

Answer 1

\(A=x^3-x^2+2\)

\(A=\left(x^3+x^2\right)-\left(2x^2+2x\right)+\left(2x+2\right)\)

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

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

Answer 2

b: =x^3-4x^2+5x^2-20x+6x-24

=(x-4)(x^2+5x+6)

=(x-4)(x+2)(x+3)