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Simplifying x2 + 4x + -168 = 0 Reorder the terms: -168 + 4x + x2 = 0 Solving -168 + 4x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '168' to each side of the equation. -168 + 4x + 168 + x2 = 0 + 168 Reorder the terms: -168 + 168 + 4x + x2 = 0 + 168 Combine like terms: -168 + 168 = 0 0 + 4x + x2 = 0 + 168 4x + x2 = 0 + 168 Combine like terms: 0 + 168 = 168 4x + x2 = 168 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = 168 + 4 Reorder the terms: 4 + 4x + x2 = 168 + 4 Combine like terms: 168 + 4 = 172 4 + 4x + x2 = 172 Factor a perfect square on the left side: (x + 2)(x + 2) = 172 Calculate the square root of the right side: 13.114877049 Break this problem into two subproblems by setting (x + 2) equal to 13.114877049 and -13.114877049.Subproblem 1
x + 2 = 13.114877049 Simplifying x + 2 = 13.114877049 Reorder the terms: 2 + x = 13.114877049 Solving 2 + x = 13.114877049 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 13.114877049 + -2 Combine like terms: 2 + -2 = 0 0 + x = 13.114877049 + -2 x = 13.114877049 + -2 Combine like terms: 13.114877049 + -2 = 11.114877049 x = 11.114877049 Simplifying x = 11.114877049Subproblem 2
x + 2 = -13.114877049 Simplifying x + 2 = -13.114877049 Reorder the terms: 2 + x = -13.114877049 Solving 2 + x = -13.114877049 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -13.114877049 + -2 Combine like terms: 2 + -2 = 0 0 + x = -13.114877049 + -2 x = -13.114877049 + -2 Combine like terms: -13.114877049 + -2 = -15.114877049 x = -15.114877049 Simplifying x = -15.114877049Solution
The solution to the problem is based on the solutions from the subproblems. x = {11.114877049, -15.114877049}
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