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Simplifying
81x2 + -7 = 57
Reorder the terms:
-7 + 81x2 = 57
Solving
-7 + 81x2 = 57
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '7' to each side of the equation.
-7 + 7 + 81x2 = 57 + 7
Combine like terms: -7 + 7 = 0
0 + 81x2 = 57 + 7
81x2 = 57 + 7
Combine like terms: 57 + 7 = 64
81x2 = 64
Divide each side by '81'.
x2 = 0.7901234568
Simplifying
x2 = 0.7901234568
Take the square root of each side:
x = {-0.888888889, 0.888888889}
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