Question
$$-5f+4f^2+1 = 0$$
Answer
$$ \begin{matrix}f_1 = 1 & f_2 = \dfrac{ 1 }{ 4 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} -5f+4f^2+1 &= 0&& \text{simplify left side} \\[1 em]4f^2-5f+1 &= 0&& \\[1 em] \end{aligned} $$
$ 4x^{2}-5x+1 = 0 $ is a quadratic equation.
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