4x^4-x^2-6=0

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Solution for 4x^4-x^2-6=0 equation:


Simplifying
4x4 + -1x2 + -6 = 0

Reorder the terms:
-6 + -1x2 + 4x4 = 0

Solving
-6 + -1x2 + 4x4 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-1.5 + -0.25x2 + x4 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -0.25x2 + 1.5 + x4 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -0.25x2 + x4 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.25x2 + x4 = 0 + 1.5
-0.25x2 + x4 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-0.25x2 + x4 = 1.5

The x term is -0.25x2.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x2 + 0.015625 + x4 = 1.5 + 0.015625

Reorder the terms:
0.015625 + -0.25x2 + x4 = 1.5 + 0.015625

Combine like terms: 1.5 + 0.015625 = 1.515625
0.015625 + -0.25x2 + x4 = 1.515625

Factor a perfect square on the left side:
(x2 + -0.125)(x2 + -0.125) = 1.515625

Calculate the square root of the right side: 1.231107225

Break this problem into two subproblems by setting 
(x2 + -0.125) equal to 1.231107225 and -1.231107225.

Subproblem 1

x2 + -0.125 = 1.231107225 Simplifying x2 + -0.125 = 1.231107225 Reorder the terms: -0.125 + x2 = 1.231107225 Solving -0.125 + x2 = 1.231107225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x2 = 1.231107225 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x2 = 1.231107225 + 0.125 x2 = 1.231107225 + 0.125 Combine like terms: 1.231107225 + 0.125 = 1.356107225 x2 = 1.356107225 Simplifying x2 = 1.356107225 Take the square root of each side: x = {-1.164520169, 1.164520169}

Subproblem 2

x2 + -0.125 = -1.231107225 Simplifying x2 + -0.125 = -1.231107225 Reorder the terms: -0.125 + x2 = -1.231107225 Solving -0.125 + x2 = -1.231107225 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x2 = -1.231107225 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x2 = -1.231107225 + 0.125 x2 = -1.231107225 + 0.125 Combine like terms: -1.231107225 + 0.125 = -1.106107225 x2 = -1.106107225 Simplifying x2 = -1.106107225 Reorder the terms: 1.106107225 + x2 = -1.106107225 + 1.106107225 Combine like terms: -1.106107225 + 1.106107225 = 0.000000000 1.106107225 + 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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