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Simplifying
81x2 + 9 = 18
Reorder the terms:
9 + 81x2 = 18
Solving
9 + 81x2 = 18
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9' to each side of the equation.
9 + -9 + 81x2 = 18 + -9
Combine like terms: 9 + -9 = 0
0 + 81x2 = 18 + -9
81x2 = 18 + -9
Combine like terms: 18 + -9 = 9
81x2 = 9
Divide each side by '81'.
x2 = 0.1111111111
Simplifying
x2 = 0.1111111111
Take the square root of each side:
x = {-0.333333333, 0.333333333}
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