-x^2+60x+2700=0

Solution for -x^2+60x+2700=0 equation:

-x^2+60x+2700=0

We add all the numbers together, and all the variables

-1x^2+60x+2700=0

a = -1; b = 60; c = +2700;
Δ = b2-4ac
Δ = 602-4·(-1)·2700
Δ = 14400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{14400}=120$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(60)-120}{2*-1}=\frac{-180}{-2}
=+90
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(60)+120}{2*-1}=\frac{60}{-2}
=-30
$