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Simplifying x2 + 8x + -70 = 0 Reorder the terms: -70 + 8x + x2 = 0 Solving -70 + 8x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '70' to each side of the equation. -70 + 8x + 70 + x2 = 0 + 70 Reorder the terms: -70 + 70 + 8x + x2 = 0 + 70 Combine like terms: -70 + 70 = 0 0 + 8x + x2 = 0 + 70 8x + x2 = 0 + 70 Combine like terms: 0 + 70 = 70 8x + x2 = 70 The x term is 8x. Take half its coefficient (4). Square it (16) and add it to both sides. Add '16' to each side of the equation. 8x + 16 + x2 = 70 + 16 Reorder the terms: 16 + 8x + x2 = 70 + 16 Combine like terms: 70 + 16 = 86 16 + 8x + x2 = 86 Factor a perfect square on the left side: (x + 4)(x + 4) = 86 Calculate the square root of the right side: 9.273618495 Break this problem into two subproblems by setting (x + 4) equal to 9.273618495 and -9.273618495.Subproblem 1
x + 4 = 9.273618495 Simplifying x + 4 = 9.273618495 Reorder the terms: 4 + x = 9.273618495 Solving 4 + x = 9.273618495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 9.273618495 + -4 Combine like terms: 4 + -4 = 0 0 + x = 9.273618495 + -4 x = 9.273618495 + -4 Combine like terms: 9.273618495 + -4 = 5.273618495 x = 5.273618495 Simplifying x = 5.273618495Subproblem 2
x + 4 = -9.273618495 Simplifying x + 4 = -9.273618495 Reorder the terms: 4 + x = -9.273618495 Solving 4 + x = -9.273618495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -9.273618495 + -4 Combine like terms: 4 + -4 = 0 0 + x = -9.273618495 + -4 x = -9.273618495 + -4 Combine like terms: -9.273618495 + -4 = -13.273618495 x = -13.273618495 Simplifying x = -13.273618495Solution
The solution to the problem is based on the solutions from the subproblems. x = {5.273618495, -13.273618495}
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