-x^2-6x=15

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Solution for -x^2-6x=15 equation:


Simplifying
-1x2 + -6x = 15

Reorder the terms:
-6x + -1x2 = 15

Solving
-6x + -1x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -6x + -1x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -6x + -1x2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(15 + 6x + x2) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(15 + 6x + x2)' equal to zero and attempt to solve: Simplifying 15 + 6x + x2 = 0 Solving 15 + 6x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-15' to each side of the equation. 15 + 6x + -15 + x2 = 0 + -15 Reorder the terms: 15 + -15 + 6x + x2 = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 6x + x2 = 0 + -15 6x + x2 = 0 + -15 Combine like terms: 0 + -15 = -15 6x + x2 = -15 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 = -15 + 9 Reorder the terms: 9 + 6x + x2 = -15 + 9 Combine like terms: -15 + 9 = -6 9 + 6x + x2 = -6 Factor a perfect square on the left side: (x + 3)(x + 3) = -6 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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