8x^2+9=81

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Solution for 8x^2+9=81 equation: 


Simplifying
8x2 + 9 = 81

Reorder the terms:
9 + 8x2 = 81

Solving
9 + 8x2 = 81

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + 8x2 = 81 + -9

Combine like terms: 9 + -9 = 0
0 + 8x2 = 81 + -9
8x2 = 81 + -9

Combine like terms: 81 + -9 = 72
8x2 = 72

Divide each side by '8'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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