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Simplifying 5x(x + -1) = 18 Reorder the terms: 5x(-1 + x) = 18 (-1 * 5x + x * 5x) = 18 (-5x + 5x2) = 18 Solving -5x + 5x2 = 18 Solving for variable 'x'. Reorder the terms: -18 + -5x + 5x2 = 18 + -18 Combine like terms: 18 + -18 = 0 -18 + -5x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -3.6 + -1x + x2 = 0 Move the constant term to the right: Add '3.6' to each side of the equation. -3.6 + -1x + 3.6 + x2 = 0 + 3.6 Reorder the terms: -3.6 + 3.6 + -1x + x2 = 0 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + -1x + x2 = 0 + 3.6 -1x + x2 = 0 + 3.6 Combine like terms: 0 + 3.6 = 3.6 -1x + x2 = 3.6 The x term is -1x. 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 = 3.6 + 0.25 Reorder the terms: 0.25 + -1x + x2 = 3.6 + 0.25 Combine like terms: 3.6 + 0.25 = 3.85 0.25 + -1x + x2 = 3.85 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = 3.85 Calculate the square root of the right side: 1.962141687 Break this problem into two subproblems by setting (x + -0.5) equal to 1.962141687 and -1.962141687.Subproblem 1
x + -0.5 = 1.962141687 Simplifying x + -0.5 = 1.962141687 Reorder the terms: -0.5 + x = 1.962141687 Solving -0.5 + x = 1.962141687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 1.962141687 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.962141687 + 0.5 x = 1.962141687 + 0.5 Combine like terms: 1.962141687 + 0.5 = 2.462141687 x = 2.462141687 Simplifying x = 2.462141687Subproblem 2
x + -0.5 = -1.962141687 Simplifying x + -0.5 = -1.962141687 Reorder the terms: -0.5 + x = -1.962141687 Solving -0.5 + x = -1.962141687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -1.962141687 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.962141687 + 0.5 x = -1.962141687 + 0.5 Combine like terms: -1.962141687 + 0.5 = -1.462141687 x = -1.462141687 Simplifying x = -1.462141687Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.462141687, -1.462141687}
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