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Simplifying 3x2 + 9x + -40 = 0 Reorder the terms: -40 + 9x + 3x2 = 0 Solving -40 + 9x + 3x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. -13.33333333 + 3x + x2 = 0 Move the constant term to the right: Add '13.33333333' to each side of the equation. -13.33333333 + 3x + 13.33333333 + x2 = 0 + 13.33333333 Reorder the terms: -13.33333333 + 13.33333333 + 3x + x2 = 0 + 13.33333333 Combine like terms: -13.33333333 + 13.33333333 = 0.00000000 0.00000000 + 3x + x2 = 0 + 13.33333333 3x + x2 = 0 + 13.33333333 Combine like terms: 0 + 13.33333333 = 13.33333333 3x + x2 = 13.33333333 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 = 13.33333333 + 2.25 Reorder the terms: 2.25 + 3x + x2 = 13.33333333 + 2.25 Combine like terms: 13.33333333 + 2.25 = 15.58333333 2.25 + 3x + x2 = 15.58333333 Factor a perfect square on the left side: (x + 1.5)(x + 1.5) = 15.58333333 Calculate the square root of the right side: 3.947573094 Break this problem into two subproblems by setting (x + 1.5) equal to 3.947573094 and -3.947573094.Subproblem 1
x + 1.5 = 3.947573094 Simplifying x + 1.5 = 3.947573094 Reorder the terms: 1.5 + x = 3.947573094 Solving 1.5 + x = 3.947573094 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 = 3.947573094 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 3.947573094 + -1.5 x = 3.947573094 + -1.5 Combine like terms: 3.947573094 + -1.5 = 2.447573094 x = 2.447573094 Simplifying x = 2.447573094Subproblem 2
x + 1.5 = -3.947573094 Simplifying x + 1.5 = -3.947573094 Reorder the terms: 1.5 + x = -3.947573094 Solving 1.5 + x = -3.947573094 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 = -3.947573094 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -3.947573094 + -1.5 x = -3.947573094 + -1.5 Combine like terms: -3.947573094 + -1.5 = -5.447573094 x = -5.447573094 Simplifying x = -5.447573094Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.447573094, -5.447573094}
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