$$4w^2+25 = -20w$$
Answer
$$ w = -\frac{ 5 }{ 2 } $$
Explanation
$$ \begin{aligned} 4w^2+25 &= -20w&& \text{move all terms to the left hand side } \\[1 em]4w^2+25+20w &= 0&& \text{simplify left side} \\[1 em]4w^2+20w+25 &= 0&& \\[1 em] \end{aligned} $$
$ 4x^{2}+20x+25 = 0 $ is a quadratic equation.
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