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Simplifying
5(x2 + -81) = 0
Reorder the terms:
5(-81 + x2) = 0
(-81 * 5 + x2 * 5) = 0
(-405 + 5x2) = 0
Solving
-405 + 5x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '405' to each side of the equation.
-405 + 405 + 5x2 = 0 + 405
Combine like terms: -405 + 405 = 0
0 + 5x2 = 0 + 405
5x2 = 0 + 405
Combine like terms: 0 + 405 = 405
5x2 = 405
Divide each side by '5'.
x2 = 81
Simplifying
x2 = 81
Take the square root of each side:
x = {-9, 9}
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