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Simplifying
4x2 + 25 = 81
Reorder the terms:
25 + 4x2 = 81
Solving
25 + 4x2 = 81
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-25' to each side of the equation.
25 + -25 + 4x2 = 81 + -25
Combine like terms: 25 + -25 = 0
0 + 4x2 = 81 + -25
4x2 = 81 + -25
Combine like terms: 81 + -25 = 56
4x2 = 56
Divide each side by '4'.
x2 = 14
Simplifying
x2 = 14
Take the square root of each side:
x = {-3.741657387, 3.741657387}
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