Question

P(x)=x²-8x

 

Answer 1

P(x)=x²-8x=0 

⇒x(x-8)=0

⇒hoặc x=0

hoặc x-8=0⇒x=8

Answer 2

Đặt P(x)=0

\(\Leftrightarrow x^2-8x=0\)

\(\Leftrightarrow x\left(x-8\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=8\end{matrix}\right.\)