\(4x^2+16x+7-y^2-6y=\left(4x^2+16x+16\right)-\left(y^2+6y+9\right)=\left(2x+4\right)^2-\left(y+3\right)^2\)
\(4x^2+16x+7-y^2-6y\)
\(=\left(4x^2+16x+16\right)-\left(9+y^2+6y\right)\)
\(=\left(2x+4\right)^2-\left(y+3\right)^2\)
p/s: chúc bạn học tốt
= (4x^2 + 16x+ 16) -(y^2 + 6y +9)
= (2x+4)^2 -(y+3)^2