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Simplifying x(2 + -2x) = 800 (2 * x + -2x * x) = 800 (2x + -2x2) = 800 Solving 2x + -2x2 = 800 Solving for variable 'x'. Reorder the terms: -800 + 2x + -2x2 = 800 + -800 Combine like terms: 800 + -800 = 0 -800 + 2x + -2x2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(-400 + x + -1x2) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(-400 + x + -1x2)' equal to zero and attempt to solve: Simplifying -400 + x + -1x2 = 0 Solving -400 + x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 400 + -1x + x2 = 0 Move the constant term to the right: Add '-400' to each side of the equation. 400 + -1x + -400 + x2 = 0 + -400 Reorder the terms: 400 + -400 + -1x + x2 = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -1x + x2 = 0 + -400 -1x + x2 = 0 + -400 Combine like terms: 0 + -400 = -400 -1x + x2 = -400 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. -1x + 0.25 + x2 = -400 + 0.25 Reorder the terms: 0.25 + -1x + x2 = -400 + 0.25 Combine like terms: -400 + 0.25 = -399.75 0.25 + -1x + x2 = -399.75 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = -399.75 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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