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Simplifying x(4x + -15) = 15 Reorder the terms: x(-15 + 4x) = 15 (-15 * x + 4x * x) = 15 (-15x + 4x2) = 15 Solving -15x + 4x2 = 15 Solving for variable 'x'. Reorder the terms: -15 + -15x + 4x2 = 15 + -15 Combine like terms: 15 + -15 = 0 -15 + -15x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -3.75 + -3.75x + x2 = 0 Move the constant term to the right: Add '3.75' to each side of the equation. -3.75 + -3.75x + 3.75 + x2 = 0 + 3.75 Reorder the terms: -3.75 + 3.75 + -3.75x + x2 = 0 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + -3.75x + x2 = 0 + 3.75 -3.75x + x2 = 0 + 3.75 Combine like terms: 0 + 3.75 = 3.75 -3.75x + x2 = 3.75 The x term is -3.75x. Take half its coefficient (-1.875). Square it (3.515625) and add it to both sides. Add '3.515625' to each side of the equation. -3.75x + 3.515625 + x2 = 3.75 + 3.515625 Reorder the terms: 3.515625 + -3.75x + x2 = 3.75 + 3.515625 Combine like terms: 3.75 + 3.515625 = 7.265625 3.515625 + -3.75x + x2 = 7.265625 Factor a perfect square on the left side: (x + -1.875)(x + -1.875) = 7.265625 Calculate the square root of the right side: 2.695482332 Break this problem into two subproblems by setting (x + -1.875) equal to 2.695482332 and -2.695482332.Subproblem 1
x + -1.875 = 2.695482332 Simplifying x + -1.875 = 2.695482332 Reorder the terms: -1.875 + x = 2.695482332 Solving -1.875 + x = 2.695482332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 2.695482332 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 2.695482332 + 1.875 x = 2.695482332 + 1.875 Combine like terms: 2.695482332 + 1.875 = 4.570482332 x = 4.570482332 Simplifying x = 4.570482332Subproblem 2
x + -1.875 = -2.695482332 Simplifying x + -1.875 = -2.695482332 Reorder the terms: -1.875 + x = -2.695482332 Solving -1.875 + x = -2.695482332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -2.695482332 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -2.695482332 + 1.875 x = -2.695482332 + 1.875 Combine like terms: -2.695482332 + 1.875 = -0.820482332 x = -0.820482332 Simplifying x = -0.820482332Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.570482332, -0.820482332}
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