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Simplifying x2 + 2x = 77 Reorder the terms: 2x + x2 = 77 Solving 2x + x2 = 77 Solving for variable 'x'. Reorder the terms: -77 + 2x + x2 = 77 + -77 Combine like terms: 77 + -77 = 0 -77 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '77' to each side of the equation. -77 + 2x + 77 + x2 = 0 + 77 Reorder the terms: -77 + 77 + 2x + x2 = 0 + 77 Combine like terms: -77 + 77 = 0 0 + 2x + x2 = 0 + 77 2x + x2 = 0 + 77 Combine like terms: 0 + 77 = 77 2x + x2 = 77 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = 77 + 1 Reorder the terms: 1 + 2x + x2 = 77 + 1 Combine like terms: 77 + 1 = 78 1 + 2x + x2 = 78 Factor a perfect square on the left side: (x + 1)(x + 1) = 78 Calculate the square root of the right side: 8.831760866 Break this problem into two subproblems by setting (x + 1) equal to 8.831760866 and -8.831760866.Subproblem 1
x + 1 = 8.831760866 Simplifying x + 1 = 8.831760866 Reorder the terms: 1 + x = 8.831760866 Solving 1 + x = 8.831760866 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 8.831760866 + -1 Combine like terms: 1 + -1 = 0 0 + x = 8.831760866 + -1 x = 8.831760866 + -1 Combine like terms: 8.831760866 + -1 = 7.831760866 x = 7.831760866 Simplifying x = 7.831760866Subproblem 2
x + 1 = -8.831760866 Simplifying x + 1 = -8.831760866 Reorder the terms: 1 + x = -8.831760866 Solving 1 + x = -8.831760866 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -8.831760866 + -1 Combine like terms: 1 + -1 = 0 0 + x = -8.831760866 + -1 x = -8.831760866 + -1 Combine like terms: -8.831760866 + -1 = -9.831760866 x = -9.831760866 Simplifying x = -9.831760866Solution
The solution to the problem is based on the solutions from the subproblems. x = {7.831760866, -9.831760866}
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