Question
$$45-14z+z^2 = 0$$
Answer
$$ \begin{matrix}z_1 = 5 & z_2 = 9 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 45-14z+z^2 &= 0&& \text{simplify left side} \\[1 em]z^2-14z+45 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-14x+45 = 0 $ is a quadratic equation.
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