Question

phân tích các đa thức sau thành nhân tử

1/2x^3 + 4

Answer 1

\(\dfrac{1}{2}x^3+4\)

\(=\dfrac{1}{2}\left(x^3+8\right)\)

\(=\dfrac{1}{2}\left(x^3+2^3\right)\)

\(=\dfrac{1}{2}\left(x+2\right)\left(x^2-2\cdot x+2^2\right)\)

\(=\dfrac{1}{2}\left(x+2\right)\left(x^2-2x+4\right)\)

Answer 2

=1/2(x^3+8)

=1/2(x+2)(x^2-2x+4)