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Simplifying
4x2 = x2 + 81
Reorder the terms:
4x2 = 81 + x2
Solving
4x2 = 81 + x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-1x2' to each side of the equation.
4x2 + -1x2 = 81 + x2 + -1x2
Combine like terms: 4x2 + -1x2 = 3x2
3x2 = 81 + x2 + -1x2
Combine like terms: x2 + -1x2 = 0
3x2 = 81 + 0
3x2 = 81
Divide each side by '3'.
x2 = 27
Simplifying
x2 = 27
Take the square root of each side:
x = {-5.196152423, 5.196152423}
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