2.5=0.81t^2

Solution for 2.5=0.81t^2 equation:

Simplifying
2.5 = 0.81t2

Solving
2.5 = 0.81t2

Solving for variable 't'.

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

Add '-0.81t2' to each side of the equation.
2.5 + -0.81t2 = 0.81t2 + -0.81t2

Combine like terms: 0.81t2 + -0.81t2 = 0.00
2.5 + -0.81t2 = 0.00

Add '-2.5' to each side of the equation.
2.5 + -2.5 + -0.81t2 = 0.00 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -0.81t2 = 0.00 + -2.5
-0.81t2 = 0.00 + -2.5

Combine like terms: 0.00 + -2.5 = -2.5
-0.81t2 = -2.5

Divide each side by '-0.81'.
t2 = 3.086419753

Simplifying
t2 = 3.086419753

Take the square root of each side:
t = {-1.756820922, 1.756820922}