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Simplifying x2 + 4x + -79 = 9 Reorder the terms: -79 + 4x + x2 = 9 Solving -79 + 4x + x2 = 9 Solving for variable 'x'. Reorder the terms: -79 + -9 + 4x + x2 = 9 + -9 Combine like terms: -79 + -9 = -88 -88 + 4x + x2 = 9 + -9 Combine like terms: 9 + -9 = 0 -88 + 4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '88' to each side of the equation. -88 + 4x + 88 + x2 = 0 + 88 Reorder the terms: -88 + 88 + 4x + x2 = 0 + 88 Combine like terms: -88 + 88 = 0 0 + 4x + x2 = 0 + 88 4x + x2 = 0 + 88 Combine like terms: 0 + 88 = 88 4x + x2 = 88 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 = 88 + 4 Reorder the terms: 4 + 4x + x2 = 88 + 4 Combine like terms: 88 + 4 = 92 4 + 4x + x2 = 92 Factor a perfect square on the left side: (x + 2)(x + 2) = 92 Calculate the square root of the right side: 9.591663047 Break this problem into two subproblems by setting (x + 2) equal to 9.591663047 and -9.591663047.Subproblem 1
x + 2 = 9.591663047 Simplifying x + 2 = 9.591663047 Reorder the terms: 2 + x = 9.591663047 Solving 2 + x = 9.591663047 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 = 9.591663047 + -2 Combine like terms: 2 + -2 = 0 0 + x = 9.591663047 + -2 x = 9.591663047 + -2 Combine like terms: 9.591663047 + -2 = 7.591663047 x = 7.591663047 Simplifying x = 7.591663047Subproblem 2
x + 2 = -9.591663047 Simplifying x + 2 = -9.591663047 Reorder the terms: 2 + x = -9.591663047 Solving 2 + x = -9.591663047 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 = -9.591663047 + -2 Combine like terms: 2 + -2 = 0 0 + x = -9.591663047 + -2 x = -9.591663047 + -2 Combine like terms: -9.591663047 + -2 = -11.591663047 x = -11.591663047 Simplifying x = -11.591663047Solution
The solution to the problem is based on the solutions from the subproblems. x = {7.591663047, -11.591663047}
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