Question
$$144-25x^2 = 0$$
Answer
$$ \begin{matrix}x_1 = \dfrac{ 12 }{ 5 } & x_2 = -\dfrac{ 12 }{ 5 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 144-25x^2 &= 0&& \text{simplify left side} \\[1 em]-25x^2+144 &= 0&& \\[1 em] \end{aligned} $$
$ -25x^{2}+144 = 0 $ is a quadratic equation.
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