x^4-x^2-16=0

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Solution for x^4-x^2-16=0 equation:


Simplifying
x4 + -1x2 + -16 = 0

Reorder the terms:
-16 + -1x2 + x4 = 0

Solving
-16 + -1x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -1x2 + 16 + x4 = 0 + 16

Reorder the terms:
-16 + 16 + -1x2 + x4 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -1x2 + x4 = 0 + 16
-1x2 + x4 = 0 + 16

Combine like terms: 0 + 16 = 16
-1x2 + x4 = 16

The x term is -1x2.  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.
-1x2 + 0.25 + x4 = 16 + 0.25

Reorder the terms:
0.25 + -1x2 + x4 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
0.25 + -1x2 + x4 = 16.25

Factor a perfect square on the left side:
(x2 + -0.5)(x2 + -0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x2 + -0.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x2 + -0.5 = 4.031128874 Simplifying x2 + -0.5 = 4.031128874 Reorder the terms: -0.5 + x2 = 4.031128874 Solving -0.5 + x2 = 4.031128874 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 = 4.031128874 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x2 = 4.031128874 + 0.5 x2 = 4.031128874 + 0.5 Combine like terms: 4.031128874 + 0.5 = 4.531128874 x2 = 4.531128874 Simplifying x2 = 4.531128874 Take the square root of each side: x = {-2.128644844, 2.128644844}

Subproblem 2

x2 + -0.5 = -4.031128874 Simplifying x2 + -0.5 = -4.031128874 Reorder the terms: -0.5 + x2 = -4.031128874 Solving -0.5 + x2 = -4.031128874 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 = -4.031128874 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x2 = -4.031128874 + 0.5 x2 = -4.031128874 + 0.5 Combine like terms: -4.031128874 + 0.5 = -3.531128874 x2 = -3.531128874 Simplifying x2 = -3.531128874 Reorder the terms: 3.531128874 + x2 = -3.531128874 + 3.531128874 Combine like terms: -3.531128874 + 3.531128874 = 0.000000000 3.531128874 + 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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