-4.9t^2+21+120=0

Solution for -4.9t^2+21+120=0 equation:

Simplifying
-4.9t2 + 21 + 120 = 0

Reorder the terms:
21 + 120 + -4.9t2 = 0

Combine like terms: 21 + 120 = 141
141 + -4.9t2 = 0

Solving
141 + -4.9t2 = 0

Solving for variable 't'.

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

Add '-141' to each side of the equation.
141 + -141 + -4.9t2 = 0 + -141

Combine like terms: 141 + -141 = 0
0 + -4.9t2 = 0 + -141
-4.9t2 = 0 + -141

Combine like terms: 0 + -141 = -141
-4.9t2 = -141

Divide each side by '-4.9'.
t2 = 28.7755102

Simplifying
t2 = 28.7755102

Take the square root of each side:
t = {-5.364280958, 5.364280958}