-5x^2-2x-100=0

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Solution for -5x^2-2x-100=0 equation:


Simplifying
-5x2 + -2x + -100 = 0

Reorder the terms:
-100 + -2x + -5x2 = 0

Solving
-100 + -2x + -5x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(100 + 2x + 5x2) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(100 + 2x + 5x2)' equal to zero and attempt to solve: Simplifying 100 + 2x + 5x2 = 0 Solving 100 + 2x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 20 + 0.4x + x2 = 0 Move the constant term to the right: Add '-20' to each side of the equation. 20 + 0.4x + -20 + x2 = 0 + -20 Reorder the terms: 20 + -20 + 0.4x + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 0.4x + x2 = 0 + -20 0.4x + x2 = 0 + -20 Combine like terms: 0 + -20 = -20 0.4x + x2 = -20 The x term is 0.4x. Take half its coefficient (0.2). Square it (0.04) and add it to both sides. Add '0.04' to each side of the equation. 0.4x + 0.04 + x2 = -20 + 0.04 Reorder the terms: 0.04 + 0.4x + x2 = -20 + 0.04 Combine like terms: -20 + 0.04 = -19.96 0.04 + 0.4x + x2 = -19.96 Factor a perfect square on the left side: (x + 0.2)(x + 0.2) = -19.96 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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