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Quantitative Aptitude

Quadratic Equations

x2 x+5=7A. un...

Question

x(2x+5)=7

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Solution

$x (2 x + 5) = 7 2 x^{2} + 5 x - 7 = 0 x = \frac{{- 5 \pm \sqrt{25 + 56}}}{4} = \frac{(- 5 + \sqrt{81})}{4} = \frac{(- 5 + 9)}{4} o r \frac{(- 5 - 9)}{4} x = 1 o r - \frac{14}{4}$

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