0=-16t^2+64t+16

Solution for 0=-16t^2+64t+16 equation:

0=-16t^2+64t+16

We move all terms to the left:

0-(-16t^2+64t+16)=0

We add all the numbers together, and all the variables

-(-16t^2+64t+16)=0

We get rid of parentheses

16t^2-64t-16=0

a = 16; b = -64; c = -16;
Δ = b2-4ac
Δ = -642-4·16·(-16)
Δ = 5120
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{5120}=\sqrt{1024*5}=\sqrt{1024}*\sqrt{5}=32\sqrt{5}$
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-64)-32\sqrt{5}}{2*16}=\frac{64-32\sqrt{5}}{32}
$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-64)+32\sqrt{5}}{2*16}=\frac{64+32\sqrt{5}}{32}
$