Question

Giải phương trình: √2x²+ 7x+ 4= x+ 2

Answer 1

\(\Leftrightarrow2x^2+7x-x^2-4x=0\)

=>x(x+3)=0

=>x=0

Answer 2

\(\Leftrightarrow2x^2+7x+4=x^2+4x+4\left(x\ge-2\right)\\ \Leftrightarrow x^2+3x=0\\ \Leftrightarrow x\left(x+3\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\left(tm\right)\\x=-3\left(ktm\right)\end{matrix}\right.\)