2(x^2-9)=18

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Solution for 2(x^2-9)=18 equation: 


Simplifying
2(x2 + -9) = 18

Reorder the terms:
2(-9 + x2) = 18
(-9 * 2 + x2 * 2) = 18
(-18 + 2x2) = 18

Solving
-18 + 2x2 = 18

Solving for variable 'x'.

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

Add '18' to each side of the equation.
-18 + 18 + 2x2 = 18 + 18

Combine like terms: -18 + 18 = 0
0 + 2x2 = 18 + 18
2x2 = 18 + 18

Combine like terms: 18 + 18 = 36
2x2 = 36

Divide each side by '2'.
x2 = 18

Simplifying
x2 = 18

Take the square root of each side:
x = {-4.242640687, 4.242640687}

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