Find the value of x, if $4 x^{2} - 5 x + 20 = 0$

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Solution

$x = \frac{- (- 5) \pm \sqrt{(- 5)^{2} - 4.4 .20}}{2.4}$
$\begin{matrix} = \frac{.5 \pm \sqrt{25 - 320}}{8} = \frac{5 \pm \sqrt{- 295}}{8} = \frac{5 \pm \sqrt{295} i}{8} \end{matrix}$

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