x^4+x^2=5

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Solution for x^4+x^2=5 equation:


Simplifying
x4 + x2 = 5

Reorder the terms:
x2 + x4 = 5

Solving
x2 + x4 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + x2 + x4 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + x2 + 5 + x4 = 0 + 5

Reorder the terms:
-5 + 5 + x2 + x4 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + x2 + x4 = 0 + 5
x2 + x4 = 0 + 5

Combine like terms: 0 + 5 = 5
x2 + x4 = 5

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 = 5 + 0.25

Reorder the terms:
0.25 + x2 + x4 = 5 + 0.25

Combine like terms: 5 + 0.25 = 5.25
0.25 + x2 + x4 = 5.25

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 2.291287847 and -2.291287847.

Subproblem 1

x2 + 0.5 = 2.291287847 Simplifying x2 + 0.5 = 2.291287847 Reorder the terms: 0.5 + x2 = 2.291287847 Solving 0.5 + x2 = 2.291287847 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 = 2.291287847 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 2.291287847 + -0.5 x2 = 2.291287847 + -0.5 Combine like terms: 2.291287847 + -0.5 = 1.791287847 x2 = 1.791287847 Simplifying x2 = 1.791287847 Take the square root of each side: x = {-1.338390021, 1.338390021}

Subproblem 2

x2 + 0.5 = -2.291287847 Simplifying x2 + 0.5 = -2.291287847 Reorder the terms: 0.5 + x2 = -2.291287847 Solving 0.5 + x2 = -2.291287847 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 = -2.291287847 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -2.291287847 + -0.5 x2 = -2.291287847 + -0.5 Combine like terms: -2.291287847 + -0.5 = -2.791287847 x2 = -2.791287847 Simplifying x2 = -2.791287847 Reorder the terms: 2.791287847 + x2 = -2.791287847 + 2.791287847 Combine like terms: -2.791287847 + 2.791287847 = 0.000000000 2.791287847 + 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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