8t^2-31+21=0

Solution for 8t^2-31+21=0 equation:

Simplifying
8t2 + -31 + 21 = 0

Reorder the terms:
-31 + 21 + 8t2 = 0

Combine like terms: -31 + 21 = -10
-10 + 8t2 = 0

Solving
-10 + 8t2 = 0

Solving for variable 't'.

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

Add '10' to each side of the equation.
-10 + 10 + 8t2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 8t2 = 0 + 10
8t2 = 0 + 10

Combine like terms: 0 + 10 = 10
8t2 = 10

Divide each side by '8'.
t2 = 1.25

Simplifying
t2 = 1.25

Take the square root of each side:
t = {-1.118033989, 1.118033989}