-x^2-2x-20=0

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Solution for -x^2-2x-20=0 equation:


Simplifying
-1x2 + -2x + -20 = 0

Reorder the terms:
-20 + -2x + -1x2 = 0

Solving
-20 + -2x + -1x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(20 + 2x + x2) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(20 + 2x + x2)' equal to zero and attempt to solve: Simplifying 20 + 2x + x2 = 0 Solving 20 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-20' to each side of the equation. 20 + 2x + -20 + x2 = 0 + -20 Reorder the terms: 20 + -20 + 2x + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 2x + x2 = 0 + -20 2x + x2 = 0 + -20 Combine like terms: 0 + -20 = -20 2x + x2 = -20 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = -20 + 1 Reorder the terms: 1 + 2x + x2 = -20 + 1 Combine like terms: -20 + 1 = -19 1 + 2x + x2 = -19 Factor a perfect square on the left side: (x + 1)(x + 1) = -19 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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