x^2+18=-6x

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Solution for x^2+18=-6x equation:


Simplifying
x2 + 18 = -6x

Reorder the terms:
18 + x2 = -6x

Solving
18 + x2 = -6x

Solving for variable 'x'.

Reorder the terms:
18 + 6x + x2 = -6x + 6x

Combine like terms: -6x + 6x = 0
18 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + 6x + -18 + x2 = 0 + -18

Reorder the terms:
18 + -18 + 6x + x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + 6x + x2 = 0 + -18
6x + x2 = 0 + -18

Combine like terms: 0 + -18 = -18
6x + x2 = -18

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = -18 + 9

Reorder the terms:
9 + 6x + x2 = -18 + 9

Combine like terms: -18 + 9 = -9
9 + 6x + x2 = -9

Factor a perfect square on the left side:
(x + 3)(x + 3) = -9

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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