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Simplifying
6x2 + -15 = 81
Reorder the terms:
-15 + 6x2 = 81
Solving
-15 + 6x2 = 81
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '15' to each side of the equation.
-15 + 15 + 6x2 = 81 + 15
Combine like terms: -15 + 15 = 0
0 + 6x2 = 81 + 15
6x2 = 81 + 15
Combine like terms: 81 + 15 = 96
6x2 = 96
Divide each side by '6'.
x2 = 16
Simplifying
x2 = 16
Take the square root of each side:
x = {-4, 4}
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