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Simplifying 1 + -0.4x(x + -4) + 0.6(x + -7) = -0.6 Reorder the terms: 1 + -0.4x(-4 + x) + 0.6(x + -7) = -0.6 1 + (-4 * -0.4x + x * -0.4x) + 0.6(x + -7) = -0.6 1 + (1.6x + -0.4x2) + 0.6(x + -7) = -0.6 Reorder the terms: 1 + 1.6x + -0.4x2 + 0.6(-7 + x) = -0.6 1 + 1.6x + -0.4x2 + (-7 * 0.6 + x * 0.6) = -0.6 1 + 1.6x + -0.4x2 + (-4.2 + 0.6x) = -0.6 Reorder the terms: 1 + -4.2 + 1.6x + 0.6x + -0.4x2 = -0.6 Combine like terms: 1 + -4.2 = -3.2 -3.2 + 1.6x + 0.6x + -0.4x2 = -0.6 Combine like terms: 1.6x + 0.6x = 2.2x -3.2 + 2.2x + -0.4x2 = -0.6 Solving -3.2 + 2.2x + -0.4x2 = -0.6 Solving for variable 'x'. Reorder the terms: -3.2 + 0.6 + 2.2x + -0.4x2 = -0.6 + 0.6 Combine like terms: -3.2 + 0.6 = -2.6 -2.6 + 2.2x + -0.4x2 = -0.6 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 -2.6 + 2.2x + -0.4x2 = 0.0 Begin completing the square. Divide all terms by -0.4 the coefficient of the squared term: Divide each side by '-0.4'. 6.5 + -5.5x + x2 = 0 Move the constant term to the right: Add '-6.5' to each side of the equation. 6.5 + -5.5x + -6.5 + x2 = 0 + -6.5 Reorder the terms: 6.5 + -6.5 + -5.5x + x2 = 0 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + -5.5x + x2 = 0 + -6.5 -5.5x + x2 = 0 + -6.5 Combine like terms: 0 + -6.5 = -6.5 -5.5x + x2 = -6.5 The x term is -5.5x. Take half its coefficient (-2.75). Square it (7.5625) and add it to both sides. Add '7.5625' to each side of the equation. -5.5x + 7.5625 + x2 = -6.5 + 7.5625 Reorder the terms: 7.5625 + -5.5x + x2 = -6.5 + 7.5625 Combine like terms: -6.5 + 7.5625 = 1.0625 7.5625 + -5.5x + x2 = 1.0625 Factor a perfect square on the left side: (x + -2.75)(x + -2.75) = 1.0625 Calculate the square root of the right side: 1.030776406 Break this problem into two subproblems by setting (x + -2.75) equal to 1.030776406 and -1.030776406.Subproblem 1
x + -2.75 = 1.030776406 Simplifying x + -2.75 = 1.030776406 Reorder the terms: -2.75 + x = 1.030776406 Solving -2.75 + x = 1.030776406 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = 1.030776406 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 1.030776406 + 2.75 x = 1.030776406 + 2.75 Combine like terms: 1.030776406 + 2.75 = 3.780776406 x = 3.780776406 Simplifying x = 3.780776406Subproblem 2
x + -2.75 = -1.030776406 Simplifying x + -2.75 = -1.030776406 Reorder the terms: -2.75 + x = -1.030776406 Solving -2.75 + x = -1.030776406 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = -1.030776406 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -1.030776406 + 2.75 x = -1.030776406 + 2.75 Combine like terms: -1.030776406 + 2.75 = 1.719223594 x = 1.719223594 Simplifying x = 1.719223594Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.780776406, 1.719223594}
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