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Simplifying
3x2 + -18 = 9 + -1x2
Reorder the terms:
-18 + 3x2 = 9 + -1x2
Solving
-18 + 3x2 = 9 + -1x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add 'x2' to each side of the equation.
-18 + 3x2 + x2 = 9 + -1x2 + x2
Combine like terms: 3x2 + x2 = 4x2
-18 + 4x2 = 9 + -1x2 + x2
Combine like terms: -1x2 + x2 = 0
-18 + 4x2 = 9 + 0
-18 + 4x2 = 9
Add '18' to each side of the equation.
-18 + 18 + 4x2 = 9 + 18
Combine like terms: -18 + 18 = 0
0 + 4x2 = 9 + 18
4x2 = 9 + 18
Combine like terms: 9 + 18 = 27
4x2 = 27
Divide each side by '4'.
x2 = 6.75
Simplifying
x2 = 6.75
Take the square root of each side:
x = {-2.598076211, 2.598076211}
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