Solve the inequality $x^{2} - 5 x + 4 < 0$ .

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More Quadratic functions and inequalities questions

Find the set of values of $k$ for which the equation $x^{2} + k x + 4 = 0$ has real roots.
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Find the set of values of $k$ for which the equation $x^{2} + k x + 16 = 0$ has real roots.
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Find the set of values of $k$ for which the equation $x^{2} + k x + 1 = 0$ has real roots.