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Simplifying
169 = 81x2
Solving
169 = 81x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-81x2' to each side of the equation.
169 + -81x2 = 81x2 + -81x2
Combine like terms: 81x2 + -81x2 = 0
169 + -81x2 = 0
Add '-169' to each side of the equation.
169 + -169 + -81x2 = 0 + -169
Combine like terms: 169 + -169 = 0
0 + -81x2 = 0 + -169
-81x2 = 0 + -169
Combine like terms: 0 + -169 = -169
-81x2 = -169
Divide each side by '-81'.
x2 = 2.086419753
Simplifying
x2 = 2.086419753
Take the square root of each side:
x = {-1.444444444, 1.444444444}
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