0=(.25x^4)-(2x^2)-1

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Solution for 0=(.25x^4)-(2x^2)-1 equation:


Simplifying
0 = (0.25x4) + -1(2x2) + -1

Remove parenthesis around (2x2)
0 = (0.25x4) + -1 * 2x2 + -1

Multiply -1 * 2
0 = (0.25x4) + -2x2 + -1

Reorder the terms:
0 = -1 + -2x2 + (0.25x4)

Solving
0 = -1 + -2x2 + (0.25x4)

Solving for variable 'x'.

Combine like terms: 0 + 1 = 1
1 + 2x2 + (-0.25x4) = -1 + -2x2 + (0.25x4) + 1 + 2x2 + (-0.25x4)

Reorder the terms:
1 + 2x2 + (-0.25x4) = -1 + 1 + -2x2 + 2x2 + (0.25x4) + (-0.25x4)

Combine like terms: -1 + 1 = 0
1 + 2x2 + (-0.25x4) = 0 + -2x2 + 2x2 + (0.25x4) + (-0.25x4)
1 + 2x2 + (-0.25x4) = -2x2 + 2x2 + (0.25x4) + (-0.25x4)

Combine like terms: -2x2 + 2x2 = 0
1 + 2x2 + (-0.25x4) = 0 + (0.25x4) + (-0.25x4)
1 + 2x2 + (-0.25x4) = (0.25x4) + (-0.25x4)

Combine like terms: (0.25x4) + (-0.25x4) = 0.00
1 + 2x2 + (-0.25x4) = 0.00

Begin completing the square.  Divide all terms by
-0.25 the coefficient of the squared term: 

Divide each side by '-0.25'.
-4 + -8x2 + x4 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -8x2 + 4 + x4 = 0 + 4

Reorder the terms:
-4 + 4 + -8x2 + x4 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -8x2 + x4 = 0 + 4
-8x2 + x4 = 0 + 4

Combine like terms: 0 + 4 = 4
-8x2 + x4 = 4

The x term is -8x2.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x2 + 16 + x4 = 4 + 16

Reorder the terms:
16 + -8x2 + x4 = 4 + 16

Combine like terms: 4 + 16 = 20
16 + -8x2 + x4 = 20

Factor a perfect square on the left side:
((x2) + -4)((x2) + -4) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
((x2) + -4) equal to 4.472135955 and -4.472135955.

Subproblem 1

(x2) + -4 = 4.472135955 Simplifying (x2) + -4 = 4.472135955 x2 + -4 = 4.472135955 Reorder the terms: -4 + x2 = 4.472135955 Solving -4 + x2 = 4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = 4.472135955 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 4.472135955 + 4 x2 = 4.472135955 + 4 Combine like terms: 4.472135955 + 4 = 8.472135955 x2 = 8.472135955 Simplifying x2 = 8.472135955 Take the square root of each side: x = {-2.91069338, 2.91069338}

Subproblem 2

(x2) + -4 = -4.472135955 Simplifying (x2) + -4 = -4.472135955 x2 + -4 = -4.472135955 Reorder the terms: -4 + x2 = -4.472135955 Solving -4 + x2 = -4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = -4.472135955 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -4.472135955 + 4 x2 = -4.472135955 + 4 Combine like terms: -4.472135955 + 4 = -0.472135955 x2 = -0.472135955 Simplifying x2 = -0.472135955 Reorder the terms: 0.472135955 + x2 = -0.472135955 + 0.472135955 Combine like terms: -0.472135955 + 0.472135955 = 0.000000000 0.472135955 + 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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