X2+90x=0

Solution for X2+90x=0 equation:

X2+90X=0

We add all the numbers together, and all the variables

X^2+90X=0

a = 1; b = 90; c = 0;
Δ = b2-4ac
Δ = 902-4·1·0
Δ = 8100
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{8100}=90$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(90)-90}{2*1}=\frac{-180}{2}
=-90
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(90)+90}{2*1}=\frac{0}{2}
=0
$