Question

x2 -4+(x+2)(2x-1)

x2 -x (5x-5)=0

5x(x+6)-2x-12=0

Answer 1

5x(x+6)-2x-12=0

=>5x(x+6)-2(x+6)=0

=>(x+6)(5x-2)=0

=>\(\left[{}\begin{matrix}x+6=0\\5x-2=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-6\\x=\dfrac{2}{5}\end{matrix}\right.\)

Answer 2

x2 là x^2