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Simplifying
-9t2 + 81 = 0
Reorder the terms:
81 + -9t2 = 0
Solving
81 + -9t2 = 0
Solving for variable 't'.
Move all terms containing t to the left, all other terms to the right.
Add '-81' to each side of the equation.
81 + -81 + -9t2 = 0 + -81
Combine like terms: 81 + -81 = 0
0 + -9t2 = 0 + -81
-9t2 = 0 + -81
Combine like terms: 0 + -81 = -81
-9t2 = -81
Divide each side by '-9'.
t2 = 9
Simplifying
t2 = 9
Take the square root of each side:
t = {-3, 3}
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