x^4+x^2-25=0

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Solution for x^4+x^2-25=0 equation:


Simplifying
x4 + x2 + -25 = 0

Reorder the terms:
-25 + x2 + x4 = 0

Solving
-25 + x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + x2 + 25 + x4 = 0 + 25

Reorder the terms:
-25 + 25 + x2 + x4 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + x2 + x4 = 0 + 25
x2 + x4 = 0 + 25

Combine like terms: 0 + 25 = 25
x2 + x4 = 25

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 = 25 + 0.25

Reorder the terms:
0.25 + x2 + x4 = 25 + 0.25

Combine like terms: 25 + 0.25 = 25.25
0.25 + x2 + x4 = 25.25

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 5.024937811 and -5.024937811.

Subproblem 1

x2 + 0.5 = 5.024937811 Simplifying x2 + 0.5 = 5.024937811 Reorder the terms: 0.5 + x2 = 5.024937811 Solving 0.5 + x2 = 5.024937811 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 = 5.024937811 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 5.024937811 + -0.5 x2 = 5.024937811 + -0.5 Combine like terms: 5.024937811 + -0.5 = 4.524937811 x2 = 4.524937811 Simplifying x2 = 4.524937811 Take the square root of each side: x = {-2.127190121, 2.127190121}

Subproblem 2

x2 + 0.5 = -5.024937811 Simplifying x2 + 0.5 = -5.024937811 Reorder the terms: 0.5 + x2 = -5.024937811 Solving 0.5 + x2 = -5.024937811 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 = -5.024937811 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -5.024937811 + -0.5 x2 = -5.024937811 + -0.5 Combine like terms: -5.024937811 + -0.5 = -5.524937811 x2 = -5.524937811 Simplifying x2 = -5.524937811 Reorder the terms: 5.524937811 + x2 = -5.524937811 + 5.524937811 Combine like terms: -5.524937811 + 5.524937811 = 0.000000000 5.524937811 + 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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