80=80-20t^2

Solution for 80=80-20t^2 equation:

Simplifying
80 = 80 + -20t2

Add '-80' to each side of the equation.
80 + -80 = 80 + -80 + -20t2

Combine like terms: 80 + -80 = 0
0 = 80 + -80 + -20t2

Combine like terms: 80 + -80 = 0
0 = 0 + -20t2
0 = -20t2

Solving
0 = -20t2

Solving for variable 't'.

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

Add '20t2' to each side of the equation.
0 + 20t2 = -20t2 + 20t2
Remove the zero:
20t2 = -20t2 + 20t2

Combine like terms: -20t2 + 20t2 = 0
20t2 = 0

Divide each side by '20'.
t2 = 0

Simplifying
t2 = 0

Take the square root of each side:
t = {0}