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Simplifying 15 + -4x(x + 1) = 6x Reorder the terms: 15 + -4x(1 + x) = 6x 15 + (1 * -4x + x * -4x) = 6x 15 + (-4x + -4x2) = 6x Solving 15 + -4x + -4x2 = 6x Solving for variable 'x'. Reorder the terms: 15 + -4x + -6x + -4x2 = 6x + -6x Combine like terms: -4x + -6x = -10x 15 + -10x + -4x2 = 6x + -6x Combine like terms: 6x + -6x = 0 15 + -10x + -4x2 = 0 Begin completing the square. Divide all terms by -4 the coefficient of the squared term: Divide each side by '-4'. -3.75 + 2.5x + x2 = 0 Move the constant term to the right: Add '3.75' to each side of the equation. -3.75 + 2.5x + 3.75 + x2 = 0 + 3.75 Reorder the terms: -3.75 + 3.75 + 2.5x + x2 = 0 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + 2.5x + x2 = 0 + 3.75 2.5x + x2 = 0 + 3.75 Combine like terms: 0 + 3.75 = 3.75 2.5x + x2 = 3.75 The x term is 2.5x. Take half its coefficient (1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. 2.5x + 1.5625 + x2 = 3.75 + 1.5625 Reorder the terms: 1.5625 + 2.5x + x2 = 3.75 + 1.5625 Combine like terms: 3.75 + 1.5625 = 5.3125 1.5625 + 2.5x + x2 = 5.3125 Factor a perfect square on the left side: (x + 1.25)(x + 1.25) = 5.3125 Calculate the square root of the right side: 2.304886114 Break this problem into two subproblems by setting (x + 1.25) equal to 2.304886114 and -2.304886114.Subproblem 1
x + 1.25 = 2.304886114 Simplifying x + 1.25 = 2.304886114 Reorder the terms: 1.25 + x = 2.304886114 Solving 1.25 + x = 2.304886114 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 2.304886114 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 2.304886114 + -1.25 x = 2.304886114 + -1.25 Combine like terms: 2.304886114 + -1.25 = 1.054886114 x = 1.054886114 Simplifying x = 1.054886114Subproblem 2
x + 1.25 = -2.304886114 Simplifying x + 1.25 = -2.304886114 Reorder the terms: 1.25 + x = -2.304886114 Solving 1.25 + x = -2.304886114 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -2.304886114 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -2.304886114 + -1.25 x = -2.304886114 + -1.25 Combine like terms: -2.304886114 + -1.25 = -3.554886114 x = -3.554886114 Simplifying x = -3.554886114Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.054886114, -3.554886114}
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