x^4+x^2-396=0

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Solution for x^4+x^2-396=0 equation:


Simplifying
x4 + x2 + -396 = 0

Reorder the terms:
-396 + x2 + x4 = 0

Solving
-396 + x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '396' to each side of the equation.
-396 + x2 + 396 + x4 = 0 + 396

Reorder the terms:
-396 + 396 + x2 + x4 = 0 + 396

Combine like terms: -396 + 396 = 0
0 + x2 + x4 = 0 + 396
x2 + x4 = 0 + 396

Combine like terms: 0 + 396 = 396
x2 + x4 = 396

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 = 396 + 0.25

Reorder the terms:
0.25 + x2 + x4 = 396 + 0.25

Combine like terms: 396 + 0.25 = 396.25
0.25 + x2 + x4 = 396.25

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 396.25

Calculate the square root of the right side: 19.906029237

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 19.906029237 and -19.906029237.

Subproblem 1

x2 + 0.5 = 19.906029237 Simplifying x2 + 0.5 = 19.906029237 Reorder the terms: 0.5 + x2 = 19.906029237 Solving 0.5 + x2 = 19.906029237 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 = 19.906029237 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 19.906029237 + -0.5 x2 = 19.906029237 + -0.5 Combine like terms: 19.906029237 + -0.5 = 19.406029237 x2 = 19.406029237 Simplifying x2 = 19.406029237 Take the square root of each side: x = {-4.40522749, 4.40522749}

Subproblem 2

x2 + 0.5 = -19.906029237 Simplifying x2 + 0.5 = -19.906029237 Reorder the terms: 0.5 + x2 = -19.906029237 Solving 0.5 + x2 = -19.906029237 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 = -19.906029237 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -19.906029237 + -0.5 x2 = -19.906029237 + -0.5 Combine like terms: -19.906029237 + -0.5 = -20.406029237 x2 = -20.406029237 Simplifying x2 = -20.406029237 Reorder the terms: 20.406029237 + x2 = -20.406029237 + 20.406029237 Combine like terms: -20.406029237 + 20.406029237 = 0.000000000 20.406029237 + 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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