Question

[Hoa Anh Nguyễn]

Tìm nghiệm của đa thức:

H(x)=2x²+x

I(x)=4x³-x

M(x)=x³+2x²

Answer 1

[TV Cuber]

cho H(x)=0

\(=>2x^2+x=0\)

\(=>x\left(2x+1\right)=0=>\left[{}\begin{matrix}x=0\\2x+1=0\end{matrix}\right.=>\left[{}\begin{matrix}x=0\\x=-\dfrac{1}{2}\end{matrix}\right.\)

Answer 2

[TV Cuber]

I(x)=0

\(=>4x^3-x=0=>4.x.x.x-x=0\)

\(=>x\left(4x^2-1\right)=0\)

\(=>\left[{}\begin{matrix}x=0\\4x^2-1=0\end{matrix}\right.=>\left[{}\begin{matrix}x=0\\x^2=\dfrac{1}{4}\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{2}\\x=-\dfrac{1}{2}\end{matrix}\right.\end{matrix}\right.\)