Question

\(\left\{{}\begin{matrix}6x^2y+2y^3+35=0\\5x^2+5y^2+2xy+5x+13y=0\end{matrix}\right.\)

Answer 1

Lấy pt đầu cộng 3 lần pt 2:

\(\left(2y+5\right)\left(3x^2+3x+y^2+5y+7\right)=0\)

\(\Leftrightarrow\left(2y+5\right)\left[3\left(x+\dfrac{1}{2}\right)^2+\left(y+\dfrac{5}{2}\right)^2\right]=0\)