Question

Phân tích đa thức thành nhân tử

X^3 - 2x - 4

Answer 1

x³-2x+2x-4=x³-2x²+2x²-4x+2x-4

=x²(x-2)+2x(x-2)+2(x-2)=(x-2)(x²+2x+2)

Answer 2

\(x^3-2x-4\)

=\(x^3-8-2x+4\)

=\(\left(x-2\right)\left(x^2+2x+4\right)\)\(-2\left(x-2\right)\)

=\(\left(x-2\right)\left(x^2+2x+4-2\right)\)

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