12+9=5t^2

Solution for 12+9=5t^2 equation:

Simplifying
12 + 9 = 5t2

Combine like terms: 12 + 9 = 21
21 = 5t2

Solving
21 = 5t2

Solving for variable 't'.

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

Add '-5t2' to each side of the equation.
21 + -5t2 = 5t2 + -5t2

Combine like terms: 5t2 + -5t2 = 0
21 + -5t2 = 0

Add '-21' to each side of the equation.
21 + -21 + -5t2 = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -5t2 = 0 + -21
-5t2 = 0 + -21

Combine like terms: 0 + -21 = -21
-5t2 = -21

Divide each side by '-5'.
t2 = 4.2

Simplifying
t2 = 4.2

Take the square root of each side:
t = {-2.049390153, 2.049390153}