Question

giai pt ; (2x+7)^2=9(x+2)

Answer 1

\(\Leftrightarrow\left(2x+7\right)^2-\left(3x+6\right)^2=0\)

\(\Leftrightarrow\left(2x+7-3x-6\right)\left(2x+7+3x+6\right)=0\)

=>(1-x)(5x+13)=0

=>x=1 hoặc x=-13/5