18=4.9*t^2

Solution for 18=4.9*t^2 equation:

Simplifying
18 = 4.9t2

Solving
18 = 4.9t2

Solving for variable 't'.

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

Add '-4.9t2' to each side of the equation.
18 + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
18 + -4.9t2 = 0.0

Add '-18' to each side of the equation.
18 + -18 + -4.9t2 = 0.0 + -18

Combine like terms: 18 + -18 = 0
0 + -4.9t2 = 0.0 + -18
-4.9t2 = 0.0 + -18

Combine like terms: 0.0 + -18 = -18
-4.9t2 = -18

Divide each side by '-4.9'.
t2 = 3.673469388

Simplifying
t2 = 3.673469388

Take the square root of each side:
t = {-1.916629695, 1.916629695}