Question

C(x)=-2x(2x-3)-2(x-1)

Q(x)=2(x-3)-(x-1)

Tim nghiem

 

Answer 1

Đặt C(x)=0

\(\Leftrightarrow-2x\left(2x-3\right)-2\left(x-1\right)=0\)

\(\Leftrightarrow-4x^2+6x-2x+2=0\)

\(\Leftrightarrow-4x^2+4x+2=0\)

\(\Leftrightarrow4x^2-4x-2=0\)

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

\(\Leftrightarrow\left[{}\begin{matrix}2x-1=\sqrt{3}\\2x-1=-\sqrt{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=\sqrt{3}+1\\2x=-\sqrt{3}+1\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{\sqrt{3}+1}{2}\\x=\dfrac{-\sqrt{3}+1}{2}\end{matrix}\right.\)

Đặt Q(x)=0

\(\Leftrightarrow2\left(x-3\right)-\left(x-1\right)=0\)

\(\Leftrightarrow2x-6-x+1=0\)

\(\Leftrightarrow x=5\)