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Simplifying
4x2 + 65 = 81
Reorder the terms:
65 + 4x2 = 81
Solving
65 + 4x2 = 81
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-65' to each side of the equation.
65 + -65 + 4x2 = 81 + -65
Combine like terms: 65 + -65 = 0
0 + 4x2 = 81 + -65
4x2 = 81 + -65
Combine like terms: 81 + -65 = 16
4x2 = 16
Divide each side by '4'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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