Y=-2x^2+180

Solution for Y=-2x^2+180 equation:

=-2Y^2+180

We move all terms to the left:

-(-2Y^2+180)=0

We get rid of parentheses

2Y^2-180=0

a = 2; b = 0; c = -180;
Δ = b2-4ac
Δ = 02-4·2·(-180)
Δ = 1440
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1440}=\sqrt{144*10}=\sqrt{144}*\sqrt{10}=12\sqrt{10}$
$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-12\sqrt{10}}{2*2}=\frac{0-12\sqrt{10}}{4}
=-\frac{12\sqrt{10}}{4}
=-3\sqrt{10}
$
$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+12\sqrt{10}}{2*2}=\frac{0+12\sqrt{10}}{4}
=\frac{12\sqrt{10}}{4}
=3\sqrt{10}
$