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Simplifying x2 + 9x + -66 = 0 Reorder the terms: -66 + 9x + x2 = 0 Solving -66 + 9x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '66' to each side of the equation. -66 + 9x + 66 + x2 = 0 + 66 Reorder the terms: -66 + 66 + 9x + x2 = 0 + 66 Combine like terms: -66 + 66 = 0 0 + 9x + x2 = 0 + 66 9x + x2 = 0 + 66 Combine like terms: 0 + 66 = 66 9x + x2 = 66 The x term is 9x. Take half its coefficient (4.5). Square it (20.25) and add it to both sides. Add '20.25' to each side of the equation. 9x + 20.25 + x2 = 66 + 20.25 Reorder the terms: 20.25 + 9x + x2 = 66 + 20.25 Combine like terms: 66 + 20.25 = 86.25 20.25 + 9x + x2 = 86.25 Factor a perfect square on the left side: (x + 4.5)(x + 4.5) = 86.25 Calculate the square root of the right side: 9.287087811 Break this problem into two subproblems by setting (x + 4.5) equal to 9.287087811 and -9.287087811.Subproblem 1
x + 4.5 = 9.287087811 Simplifying x + 4.5 = 9.287087811 Reorder the terms: 4.5 + x = 9.287087811 Solving 4.5 + x = 9.287087811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 9.287087811 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 9.287087811 + -4.5 x = 9.287087811 + -4.5 Combine like terms: 9.287087811 + -4.5 = 4.787087811 x = 4.787087811 Simplifying x = 4.787087811Subproblem 2
x + 4.5 = -9.287087811 Simplifying x + 4.5 = -9.287087811 Reorder the terms: 4.5 + x = -9.287087811 Solving 4.5 + x = -9.287087811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -9.287087811 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -9.287087811 + -4.5 x = -9.287087811 + -4.5 Combine like terms: -9.287087811 + -4.5 = -13.787087811 x = -13.787087811 Simplifying x = -13.787087811Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.787087811, -13.787087811}
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