Question

x²+7x+10=0

Answer 1

\(\Leftrightarrow x^2+2x+5x+10=0\\ \Leftrightarrow\left(x+2\right)\left(x+5\right)=0\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=-5\end{matrix}\right.\)

Answer 2

x²+2x+5x+10=0

x(x+2)+5x+5.2=0

x(x+2)+5(x+2)=0

(X+2)(x+5)=0

Th1: x+2=0

x=-2

Th2 : x+5=0

x=-5