0=-11x^2+1100x-9900

Solution for 0=-11x^2+1100x-9900 equation:

0=-11x^2+1100x-9900

We move all terms to the left:

0-(-11x^2+1100x-9900)=0

We add all the numbers together, and all the variables

-(-11x^2+1100x-9900)=0

We get rid of parentheses

11x^2-1100x+9900=0

a = 11; b = -1100; c = +9900;
Δ = b2-4ac
Δ = -11002-4·11·9900
Δ = 774400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{774400}=880$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1100)-880}{2*11}=\frac{220}{22}
=10
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1100)+880}{2*11}=\frac{1980}{22}
=90
$