3x2+11x=90

Solution for 3x2+11x=90 equation:

3x^2+11x=90

We move all terms to the left:

3x^2+11x-(90)=0

a = 3; b = 11; c = -90;
Δ = b2-4ac
Δ = 112-4·3·(-90)
Δ = 1201
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(11)-\sqrt{1201}}{2*3}=\frac{-11-\sqrt{1201}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+\sqrt{1201}}{2*3}=\frac{-11+\sqrt{1201}}{6}
$