Question

solve the following quadratic equation (x+3)2+25=0

Answer 1

$2\cdot(x+3)+25=0$ ⇒ $2x+2\cdot3=0-25$

$2x+6=-25$ ⇒ $2x=-25-6$ ⇒ $2x=-31$

$x= \frac{-31}{2}$ ⇒ $\boxed {x=-15,5}$