Question
$$10+5x^2 = 135$$
Answer
$$ \begin{matrix}x_1 = 5 & x_2 = -5 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 10+5x^2 &= 135&& \text{simplify left side} \\[1 em]5x^2+10 &= 135&& \text{move all terms to the left hand side } \\[1 em]5x^2+10-135 &= 0&& \text{simplify left side} \\[1 em]5x^2-125 &= 0&& \\[1 em] \end{aligned} $$
$ 5x^{2}-125 = 0 $ is a quadratic equation.
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