Question

What is 2x2+11x-15=0

Answer 1

$2x^{2} + 11x - 15 = 0$

Use the quadratic equation:
$x = \frac{-b \pm \sqrt{b^{2} - 4ac}}{2a}$
$= \frac{-11 \pm \sqrt{121 - 4(2)(-15)}}{4}$
$= \frac{-11 \pm \sqrt{121 + 120}}{4}$
$= \frac{-11 \pm \sqrt{241}}{4}$

$\therefore x = \frac{-11 + \sqrt{241}}{4}$
or $x = \frac{-11 - \sqrt{241}}{4}$