Question

A(x)=x^2 -3x+1-x^2

B(x)=6-1/3x

C(x)=x^2+2x

D(x)=4x^2-1

E(x)=2x^2+3x

G(x)=(-x+1) (x^2-1)

H(x)=9x^3-4x

k(x)=x^3+x

Answer 1

tìm nghiệm hay j

Answer 2

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

cho A(x) = 0

\(=>-3x+1=0=>-3x=-1=>x=\dfrac{1}{3}\)

cho B(x) = 0

\(=>6-\dfrac{1}{3}x=0=>\dfrac{1}{3}x=6=>x=6\times3=18\)

Cho C(x)=0

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

 

Answer 3

cho D(x) =0

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

cho E(x)=0

 \(=>2x^2+3x=0=>x\left(2x+3\right)=0=>\left[{}\begin{matrix}x=0\\2x=-3\end{matrix}\right.=>\left[{}\begin{matrix}x=0\\x=-\dfrac{3}{2}\end{matrix}\right.\)