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Simplifying -5x(-2x + 7) = 55 Reorder the terms: -5x(7 + -2x) = 55 (7 * -5x + -2x * -5x) = 55 (-35x + 10x2) = 55 Solving -35x + 10x2 = 55 Solving for variable 'x'. Reorder the terms: -55 + -35x + 10x2 = 55 + -55 Combine like terms: 55 + -55 = 0 -55 + -35x + 10x2 = 0 Factor out the Greatest Common Factor (GCF), '5'. 5(-11 + -7x + 2x2) = 0 Ignore the factor 5.Subproblem 1
Set the factor '(-11 + -7x + 2x2)' equal to zero and attempt to solve: Simplifying -11 + -7x + 2x2 = 0 Solving -11 + -7x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -5.5 + -3.5x + x2 = 0 Move the constant term to the right: Add '5.5' to each side of the equation. -5.5 + -3.5x + 5.5 + x2 = 0 + 5.5 Reorder the terms: -5.5 + 5.5 + -3.5x + x2 = 0 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + -3.5x + x2 = 0 + 5.5 -3.5x + x2 = 0 + 5.5 Combine like terms: 0 + 5.5 = 5.5 -3.5x + x2 = 5.5 The x term is -3.5x. Take half its coefficient (-1.75). Square it (3.0625) and add it to both sides. Add '3.0625' to each side of the equation. -3.5x + 3.0625 + x2 = 5.5 + 3.0625 Reorder the terms: 3.0625 + -3.5x + x2 = 5.5 + 3.0625 Combine like terms: 5.5 + 3.0625 = 8.5625 3.0625 + -3.5x + x2 = 8.5625 Factor a perfect square on the left side: (x + -1.75)(x + -1.75) = 8.5625 Calculate the square root of the right side: 2.926174978 Break this problem into two subproblems by setting (x + -1.75) equal to 2.926174978 and -2.926174978.Subproblem 1
x + -1.75 = 2.926174978 Simplifying x + -1.75 = 2.926174978 Reorder the terms: -1.75 + x = 2.926174978 Solving -1.75 + x = 2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 2.926174978 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 2.926174978 + 1.75 x = 2.926174978 + 1.75 Combine like terms: 2.926174978 + 1.75 = 4.676174978 x = 4.676174978 Simplifying x = 4.676174978Subproblem 2
x + -1.75 = -2.926174978 Simplifying x + -1.75 = -2.926174978 Reorder the terms: -1.75 + x = -2.926174978 Solving -1.75 + x = -2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -2.926174978 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -2.926174978 + 1.75 x = -2.926174978 + 1.75 Combine like terms: -2.926174978 + 1.75 = -1.176174978 x = -1.176174978 Simplifying x = -1.176174978Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.676174978, -1.176174978}Solution
x = {4.676174978, -1.176174978}
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