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Simplifying -5x(x + 1) = 13 Reorder the terms: -5x(1 + x) = 13 (1 * -5x + x * -5x) = 13 (-5x + -5x2) = 13 Solving -5x + -5x2 = 13 Solving for variable 'x'. Reorder the terms: -13 + -5x + -5x2 = 13 + -13 Combine like terms: 13 + -13 = 0 -13 + -5x + -5x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(13 + 5x + 5x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(13 + 5x + 5x2)' equal to zero and attempt to solve: Simplifying 13 + 5x + 5x2 = 0 Solving 13 + 5x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 2.6 + x + x2 = 0 Move the constant term to the right: Add '-2.6' to each side of the equation. 2.6 + x + -2.6 + x2 = 0 + -2.6 Reorder the terms: 2.6 + -2.6 + x + x2 = 0 + -2.6 Combine like terms: 2.6 + -2.6 = 0.0 0.0 + x + x2 = 0 + -2.6 x + x2 = 0 + -2.6 Combine like terms: 0 + -2.6 = -2.6 x + x2 = -2.6 The x term is x. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. + 0.25 + x2 = -2.6 + 0.25 Combine like terms: + 0.25 = 1.25 1.25 + x2 = -2.6 + 0.25 Combine like terms: -2.6 + 0.25 = -2.35 1.25 + x2 = -2.35 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = -2.35 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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