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Simplifying x4 + x2 + -21 = 0 Reorder the terms: -21 + x2 + x4 = 0 Solving -21 + x2 + x4 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '21' to each side of the equation. -21 + x2 + 21 + x4 = 0 + 21 Reorder the terms: -21 + 21 + x2 + x4 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + x2 + x4 = 0 + 21 x2 + x4 = 0 + 21 Combine like terms: 0 + 21 = 21 x2 + x4 = 21 The x term is x2. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. x2 + 0.25 + x4 = 21 + 0.25 Reorder the terms: 0.25 + x2 + x4 = 21 + 0.25 Combine like terms: 21 + 0.25 = 21.25 0.25 + x2 + x4 = 21.25 Factor a perfect square on the left side: (x2 + 0.5)(x2 + 0.5) = 21.25 Calculate the square root of the right side: 4.609772229 Break this problem into two subproblems by setting (x2 + 0.5) equal to 4.609772229 and -4.609772229.Subproblem 1
x2 + 0.5 = 4.609772229 Simplifying x2 + 0.5 = 4.609772229 Reorder the terms: 0.5 + x2 = 4.609772229 Solving 0.5 + x2 = 4.609772229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = 4.609772229 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 4.609772229 + -0.5 x2 = 4.609772229 + -0.5 Combine like terms: 4.609772229 + -0.5 = 4.109772229 x2 = 4.109772229 Simplifying x2 = 4.109772229 Take the square root of each side: x = {-2.027257317, 2.027257317}Subproblem 2
x2 + 0.5 = -4.609772229 Simplifying x2 + 0.5 = -4.609772229 Reorder the terms: 0.5 + x2 = -4.609772229 Solving 0.5 + x2 = -4.609772229 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = -4.609772229 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -4.609772229 + -0.5 x2 = -4.609772229 + -0.5 Combine like terms: -4.609772229 + -0.5 = -5.109772229 x2 = -5.109772229 Simplifying x2 = -5.109772229 Reorder the terms: 5.109772229 + x2 = -5.109772229 + 5.109772229 Combine like terms: -5.109772229 + 5.109772229 = 0.000000000 5.109772229 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.
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