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Simplifying x4 + -9x2 + 1 = 0 Reorder the terms: 1 + -9x2 + x4 = 0 Solving 1 + -9x2 + x4 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-1' to each side of the equation. 1 + -9x2 + -1 + x4 = 0 + -1 Reorder the terms: 1 + -1 + -9x2 + x4 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -9x2 + x4 = 0 + -1 -9x2 + x4 = 0 + -1 Combine like terms: 0 + -1 = -1 -9x2 + x4 = -1 The x term is -9x2. 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. -9x2 + 20.25 + x4 = -1 + 20.25 Reorder the terms: 20.25 + -9x2 + x4 = -1 + 20.25 Combine like terms: -1 + 20.25 = 19.25 20.25 + -9x2 + x4 = 19.25 Factor a perfect square on the left side: (x2 + -4.5)(x2 + -4.5) = 19.25 Calculate the square root of the right side: 4.387482194 Break this problem into two subproblems by setting (x2 + -4.5) equal to 4.387482194 and -4.387482194.Subproblem 1
x2 + -4.5 = 4.387482194 Simplifying x2 + -4.5 = 4.387482194 Reorder the terms: -4.5 + x2 = 4.387482194 Solving -4.5 + x2 = 4.387482194 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 + x2 = 4.387482194 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x2 = 4.387482194 + 4.5 x2 = 4.387482194 + 4.5 Combine like terms: 4.387482194 + 4.5 = 8.887482194 x2 = 8.887482194 Simplifying x2 = 8.887482194 Take the square root of each side: x = {-2.981188051, 2.981188051}Subproblem 2
x2 + -4.5 = -4.387482194 Simplifying x2 + -4.5 = -4.387482194 Reorder the terms: -4.5 + x2 = -4.387482194 Solving -4.5 + x2 = -4.387482194 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 + x2 = -4.387482194 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x2 = -4.387482194 + 4.5 x2 = -4.387482194 + 4.5 Combine like terms: -4.387482194 + 4.5 = 0.112517806 x2 = 0.112517806 Simplifying x2 = 0.112517806 Take the square root of each side: x = {-0.335436739, 0.335436739}Solution
The solution to the problem is based on the solutions from the subproblems. x = {-2.981188051, 2.981188051, -0.335436739, 0.335436739}
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