x^4+x^2-88=0

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Solution for x^4+x^2-88=0 equation:


Simplifying
x4 + x2 + -88 = 0

Reorder the terms:
-88 + x2 + x4 = 0

Solving
-88 + x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + x2 + 88 + x4 = 0 + 88

Reorder the terms:
-88 + 88 + x2 + x4 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + x2 + x4 = 0 + 88
x2 + x4 = 0 + 88

Combine like terms: 0 + 88 = 88
x2 + x4 = 88

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 = 88 + 0.25

Reorder the terms:
0.25 + x2 + x4 = 88 + 0.25

Combine like terms: 88 + 0.25 = 88.25
0.25 + x2 + x4 = 88.25

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 88.25

Calculate the square root of the right side: 9.394147114

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 9.394147114 and -9.394147114.

Subproblem 1

x2 + 0.5 = 9.394147114 Simplifying x2 + 0.5 = 9.394147114 Reorder the terms: 0.5 + x2 = 9.394147114 Solving 0.5 + x2 = 9.394147114 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 = 9.394147114 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 9.394147114 + -0.5 x2 = 9.394147114 + -0.5 Combine like terms: 9.394147114 + -0.5 = 8.894147114 x2 = 8.894147114 Simplifying x2 = 8.894147114 Take the square root of each side: x = {-2.982305671, 2.982305671}

Subproblem 2

x2 + 0.5 = -9.394147114 Simplifying x2 + 0.5 = -9.394147114 Reorder the terms: 0.5 + x2 = -9.394147114 Solving 0.5 + x2 = -9.394147114 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 = -9.394147114 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -9.394147114 + -0.5 x2 = -9.394147114 + -0.5 Combine like terms: -9.394147114 + -0.5 = -9.894147114 x2 = -9.894147114 Simplifying x2 = -9.894147114 Reorder the terms: 9.894147114 + x2 = -9.894147114 + 9.894147114 Combine like terms: -9.894147114 + 9.894147114 = 0.000000000 9.894147114 + 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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