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Simplifying
81x2 + -18 = 7
Reorder the terms:
-18 + 81x2 = 7
Solving
-18 + 81x2 = 7
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '18' to each side of the equation.
-18 + 18 + 81x2 = 7 + 18
Combine like terms: -18 + 18 = 0
0 + 81x2 = 7 + 18
81x2 = 7 + 18
Combine like terms: 7 + 18 = 25
81x2 = 25
Divide each side by '81'.
x2 = 0.3086419753
Simplifying
x2 = 0.3086419753
Take the square root of each side:
x = {-0.555555556, 0.555555556}
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