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Simplifying x2 + -7x + -80 = 0 Reorder the terms: -80 + -7x + x2 = 0 Solving -80 + -7x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '80' to each side of the equation. -80 + -7x + 80 + x2 = 0 + 80 Reorder the terms: -80 + 80 + -7x + x2 = 0 + 80 Combine like terms: -80 + 80 = 0 0 + -7x + x2 = 0 + 80 -7x + x2 = 0 + 80 Combine like terms: 0 + 80 = 80 -7x + x2 = 80 The x term is -7x. Take half its coefficient (-3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. -7x + 12.25 + x2 = 80 + 12.25 Reorder the terms: 12.25 + -7x + x2 = 80 + 12.25 Combine like terms: 80 + 12.25 = 92.25 12.25 + -7x + x2 = 92.25 Factor a perfect square on the left side: (x + -3.5)(x + -3.5) = 92.25 Calculate the square root of the right side: 9.604686356 Break this problem into two subproblems by setting (x + -3.5) equal to 9.604686356 and -9.604686356.Subproblem 1
x + -3.5 = 9.604686356 Simplifying x + -3.5 = 9.604686356 Reorder the terms: -3.5 + x = 9.604686356 Solving -3.5 + x = 9.604686356 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 9.604686356 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 9.604686356 + 3.5 x = 9.604686356 + 3.5 Combine like terms: 9.604686356 + 3.5 = 13.104686356 x = 13.104686356 Simplifying x = 13.104686356Subproblem 2
x + -3.5 = -9.604686356 Simplifying x + -3.5 = -9.604686356 Reorder the terms: -3.5 + x = -9.604686356 Solving -3.5 + x = -9.604686356 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -9.604686356 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -9.604686356 + 3.5 x = -9.604686356 + 3.5 Combine like terms: -9.604686356 + 3.5 = -6.104686356 x = -6.104686356 Simplifying x = -6.104686356Solution
The solution to the problem is based on the solutions from the subproblems. x = {13.104686356, -6.104686356}
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