x^4+x^2-130=0

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Solution for x^4+x^2-130=0 equation:


Simplifying
x4 + x2 + -130 = 0

Reorder the terms:
-130 + x2 + x4 = 0

Solving
-130 + x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '130' to each side of the equation.
-130 + x2 + 130 + x4 = 0 + 130

Reorder the terms:
-130 + 130 + x2 + x4 = 0 + 130

Combine like terms: -130 + 130 = 0
0 + x2 + x4 = 0 + 130
x2 + x4 = 0 + 130

Combine like terms: 0 + 130 = 130
x2 + x4 = 130

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 = 130 + 0.25

Reorder the terms:
0.25 + x2 + x4 = 130 + 0.25

Combine like terms: 130 + 0.25 = 130.25
0.25 + x2 + x4 = 130.25

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 130.25

Calculate the square root of the right side: 11.412712211

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 11.412712211 and -11.412712211.

Subproblem 1

x2 + 0.5 = 11.412712211 Simplifying x2 + 0.5 = 11.412712211 Reorder the terms: 0.5 + x2 = 11.412712211 Solving 0.5 + x2 = 11.412712211 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 = 11.412712211 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 11.412712211 + -0.5 x2 = 11.412712211 + -0.5 Combine like terms: 11.412712211 + -0.5 = 10.912712211 x2 = 10.912712211 Simplifying x2 = 10.912712211 Take the square root of each side: x = {-3.303439452, 3.303439452}

Subproblem 2

x2 + 0.5 = -11.412712211 Simplifying x2 + 0.5 = -11.412712211 Reorder the terms: 0.5 + x2 = -11.412712211 Solving 0.5 + x2 = -11.412712211 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 = -11.412712211 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -11.412712211 + -0.5 x2 = -11.412712211 + -0.5 Combine like terms: -11.412712211 + -0.5 = -11.912712211 x2 = -11.912712211 Simplifying x2 = -11.912712211 Reorder the terms: 11.912712211 + x2 = -11.912712211 + 11.912712211 Combine like terms: -11.912712211 + 11.912712211 = 0.000000000 11.912712211 + 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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