Question
$$(4f-1)f^2+f+1 = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} (4f-1)f^2+f+1 &= 0&& \text{simplify left side} \\[1 em]4f^3-f^2+f+1 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
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Equations Solver