-16t^2+80+3.5=0

Solution for -16t^2+80+3.5=0 equation:

Simplifying
-16t2 + 80 + 3.5 = 0

Reorder the terms:
80 + 3.5 + -16t2 = 0

Combine like terms: 80 + 3.5 = 83.5
83.5 + -16t2 = 0

Solving
83.5 + -16t2 = 0

Solving for variable 't'.

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

Add '-83.5' to each side of the equation.
83.5 + -83.5 + -16t2 = 0 + -83.5

Combine like terms: 83.5 + -83.5 = 0.0
0.0 + -16t2 = 0 + -83.5
-16t2 = 0 + -83.5

Combine like terms: 0 + -83.5 = -83.5
-16t2 = -83.5

Divide each side by '-16'.
t2 = 5.21875

Simplifying
t2 = 5.21875

Take the square root of each side:
t = {-2.28445836, 2.28445836}