x^2+9x=330

Solution for x^2+9x=330 equation:

x^2+9x=330

We move all terms to the left:

x^2+9x-(330)=0

a = 1; b = 9; c = -330;
Δ = b2-4ac
Δ = 92-4·1·(-330)
Δ = 1401
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{-(9)-\sqrt{1401}}{2*1}=\frac{-9-\sqrt{1401}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{1401}}{2*1}=\frac{-9+\sqrt{1401}}{2}
$