30=.8t^2

Solution for 30=.8t^2 equation:

Simplifying
30 = 0.8t2

Solving
30 = 0.8t2

Solving for variable 't'.

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

Add '-0.8t2' to each side of the equation.
30 + -0.8t2 = 0.8t2 + -0.8t2

Combine like terms: 0.8t2 + -0.8t2 = 0.0
30 + -0.8t2 = 0.0

Add '-30' to each side of the equation.
30 + -30 + -0.8t2 = 0.0 + -30

Combine like terms: 30 + -30 = 0
0 + -0.8t2 = 0.0 + -30
-0.8t2 = 0.0 + -30

Combine like terms: 0.0 + -30 = -30
-0.8t2 = -30

Divide each side by '-0.8'.
t2 = 37.5

Simplifying
t2 = 37.5

Take the square root of each side:
t = {-6.123724357, 6.123724357}