30=-16x^2+60

Solution for 30=-16x^2+60 equation:

30=-16x^2+60

We move all terms to the left:

30-(-16x^2+60)=0

We get rid of parentheses

16x^2-60+30=0

We add all the numbers together, and all the variables

16x^2-30=0

a = 16; b = 0; c = -30;
Δ = b2-4ac
Δ = 02-4·16·(-30)
Δ = 1920
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1920}=\sqrt{64*30}=\sqrt{64}*\sqrt{30}=8\sqrt{30}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-8\sqrt{30}}{2*16}=\frac{0-8\sqrt{30}}{32}
=-\frac{8\sqrt{30}}{32}
=-\frac{\sqrt{30}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+8\sqrt{30}}{2*16}=\frac{0+8\sqrt{30}}{32}
=\frac{8\sqrt{30}}{32}
=\frac{\sqrt{30}}{4}
$