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Simplifying 4x(x + -1) = 7 Reorder the terms: 4x(-1 + x) = 7 (-1 * 4x + x * 4x) = 7 (-4x + 4x2) = 7 Solving -4x + 4x2 = 7 Solving for variable 'x'. Reorder the terms: -7 + -4x + 4x2 = 7 + -7 Combine like terms: 7 + -7 = 0 -7 + -4x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -1.75 + -1x + x2 = 0 Move the constant term to the right: Add '1.75' to each side of the equation. -1.75 + -1x + 1.75 + x2 = 0 + 1.75 Reorder the terms: -1.75 + 1.75 + -1x + x2 = 0 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + -1x + x2 = 0 + 1.75 -1x + x2 = 0 + 1.75 Combine like terms: 0 + 1.75 = 1.75 -1x + x2 = 1.75 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 = 1.75 + 0.25 Reorder the terms: 0.25 + -1x + x2 = 1.75 + 0.25 Combine like terms: 1.75 + 0.25 = 2 0.25 + -1x + x2 = 2 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = 2 Calculate the square root of the right side: 1.414213562 Break this problem into two subproblems by setting (x + -0.5) equal to 1.414213562 and -1.414213562.Subproblem 1
x + -0.5 = 1.414213562 Simplifying x + -0.5 = 1.414213562 Reorder the terms: -0.5 + x = 1.414213562 Solving -0.5 + x = 1.414213562 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 = 1.414213562 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.414213562 + 0.5 x = 1.414213562 + 0.5 Combine like terms: 1.414213562 + 0.5 = 1.914213562 x = 1.914213562 Simplifying x = 1.914213562Subproblem 2
x + -0.5 = -1.414213562 Simplifying x + -0.5 = -1.414213562 Reorder the terms: -0.5 + x = -1.414213562 Solving -0.5 + x = -1.414213562 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 = -1.414213562 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.414213562 + 0.5 x = -1.414213562 + 0.5 Combine like terms: -1.414213562 + 0.5 = -0.914213562 x = -0.914213562 Simplifying x = -0.914213562Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.914213562, -0.914213562}
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