Question

Tìm x biết (x-1)^2-(x+2)(x-2)=8

Answer 1

\(\Leftrightarrow x^2-2x+1-x^2+4=8\\ \Leftrightarrow-2x=8-4-1\\ \Leftrightarrow-2x=3\\ \Leftrightarrow x=-\dfrac{3}{2}\)

Answer 2

\(\Leftrightarrow x^2-2x+1-x^2+4=8\\ \Leftrightarrow-2x=3\Leftrightarrow x=-\dfrac{3}{2}\)