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Simplifying 3x2 + -39x + -7 = 0 Reorder the terms: -7 + -39x + 3x2 = 0 Solving -7 + -39x + 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'. -2.333333333 + -13x + x2 = 0 Move the constant term to the right: Add '2.333333333' to each side of the equation. -2.333333333 + -13x + 2.333333333 + x2 = 0 + 2.333333333 Reorder the terms: -2.333333333 + 2.333333333 + -13x + x2 = 0 + 2.333333333 Combine like terms: -2.333333333 + 2.333333333 = 0.000000000 0.000000000 + -13x + x2 = 0 + 2.333333333 -13x + x2 = 0 + 2.333333333 Combine like terms: 0 + 2.333333333 = 2.333333333 -13x + x2 = 2.333333333 The x term is -13x. Take half its coefficient (-6.5). Square it (42.25) and add it to both sides. Add '42.25' to each side of the equation. -13x + 42.25 + x2 = 2.333333333 + 42.25 Reorder the terms: 42.25 + -13x + x2 = 2.333333333 + 42.25 Combine like terms: 2.333333333 + 42.25 = 44.583333333 42.25 + -13x + x2 = 44.583333333 Factor a perfect square on the left side: (x + -6.5)(x + -6.5) = 44.583333333 Calculate the square root of the right side: 6.677075208 Break this problem into two subproblems by setting (x + -6.5) equal to 6.677075208 and -6.677075208.Subproblem 1
x + -6.5 = 6.677075208 Simplifying x + -6.5 = 6.677075208 Reorder the terms: -6.5 + x = 6.677075208 Solving -6.5 + x = 6.677075208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 6.677075208 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 6.677075208 + 6.5 x = 6.677075208 + 6.5 Combine like terms: 6.677075208 + 6.5 = 13.177075208 x = 13.177075208 Simplifying x = 13.177075208Subproblem 2
x + -6.5 = -6.677075208 Simplifying x + -6.5 = -6.677075208 Reorder the terms: -6.5 + x = -6.677075208 Solving -6.5 + x = -6.677075208 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -6.677075208 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -6.677075208 + 6.5 x = -6.677075208 + 6.5 Combine like terms: -6.677075208 + 6.5 = -0.177075208 x = -0.177075208 Simplifying x = -0.177075208Solution
The solution to the problem is based on the solutions from the subproblems. x = {13.177075208, -0.177075208}
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