Question

Find roots of $2x^2+x-4=0$.

Answer 1

$2x^2+x-4=0$

$a=2,b=1,c=-4$

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$=\frac{-1\pm \sqrt{1^2-4\left(2\right)(-4)}}{2\left(2\right)}$

$=\frac{-1\pm \sqrt{1+32}}{4}$

$=\frac{-1\pm \sqrt{33}}{4}$