30=-16t^2+24t+30

Solution for 30=-16t^2+24t+30 equation:

30=-16t^2+24t+30

We move all terms to the left:

30-(-16t^2+24t+30)=0

We get rid of parentheses

16t^2-24t-30+30=0

We add all the numbers together, and all the variables

16t^2-24t=0

a = 16; b = -24; c = 0;
Δ = b2-4ac
Δ = -242-4·16·0
Δ = 576
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{576}=24$
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-24)-24}{2*16}=\frac{0}{32}
=0
$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-24)+24}{2*16}=\frac{48}{32}
=1+1/2
$