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Simplifying 2x(x + -3) = 15 Reorder the terms: 2x(-3 + x) = 15 (-3 * 2x + x * 2x) = 15 (-6x + 2x2) = 15 Solving -6x + 2x2 = 15 Solving for variable 'x'. Reorder the terms: -15 + -6x + 2x2 = 15 + -15 Combine like terms: 15 + -15 = 0 -15 + -6x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -7.5 + -3x + x2 = 0 Move the constant term to the right: Add '7.5' to each side of the equation. -7.5 + -3x + 7.5 + x2 = 0 + 7.5 Reorder the terms: -7.5 + 7.5 + -3x + x2 = 0 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + -3x + x2 = 0 + 7.5 -3x + x2 = 0 + 7.5 Combine like terms: 0 + 7.5 = 7.5 -3x + x2 = 7.5 The x term is -3x. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3x + 2.25 + x2 = 7.5 + 2.25 Reorder the terms: 2.25 + -3x + x2 = 7.5 + 2.25 Combine like terms: 7.5 + 2.25 = 9.75 2.25 + -3x + x2 = 9.75 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = 9.75 Calculate the square root of the right side: 3.122498999 Break this problem into two subproblems by setting (x + -1.5) equal to 3.122498999 and -3.122498999.Subproblem 1
x + -1.5 = 3.122498999 Simplifying x + -1.5 = 3.122498999 Reorder the terms: -1.5 + x = 3.122498999 Solving -1.5 + x = 3.122498999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.122498999 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.122498999 + 1.5 x = 3.122498999 + 1.5 Combine like terms: 3.122498999 + 1.5 = 4.622498999 x = 4.622498999 Simplifying x = 4.622498999Subproblem 2
x + -1.5 = -3.122498999 Simplifying x + -1.5 = -3.122498999 Reorder the terms: -1.5 + x = -3.122498999 Solving -1.5 + x = -3.122498999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.122498999 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.122498999 + 1.5 x = -3.122498999 + 1.5 Combine like terms: -3.122498999 + 1.5 = -1.622498999 x = -1.622498999 Simplifying x = -1.622498999Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.622498999, -1.622498999}
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