0=-16t^2+90

Solution for 0=-16t^2+90 equation:

Simplifying
0 = -16t2 + 90

Reorder the terms:
0 = 90 + -16t2

Solving
0 = 90 + -16t2

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Add '16t2' to each side of the equation.
0 + 16t2 = 90 + -16t2 + 16t2
Remove the zero:
16t2 = 90 + -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
16t2 = 90 + 0
16t2 = 90

Divide each side by '16'.
t2 = 5.625

Simplifying
t2 = 5.625

Take the square root of each side:
t = {-2.371708245, 2.371708245}