2t^2-81=5

Solution for 2t^2-81=5 equation:

Simplifying
2t2 + -81 = 5

Reorder the terms:
-81 + 2t2 = 5

Solving
-81 + 2t2 = 5

Solving for variable 't'.

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

Add '81' to each side of the equation.
-81 + 81 + 2t2 = 5 + 81

Combine like terms: -81 + 81 = 0
0 + 2t2 = 5 + 81
2t2 = 5 + 81

Combine like terms: 5 + 81 = 86
2t2 = 86

Divide each side by '2'.
t2 = 43

Simplifying
t2 = 43

Take the square root of each side:
t = {-6.557438524, 6.557438524}