x^4-16x^2=4

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


Simplifying
x4 + -16x2 = 4

Reorder the terms:
-16x2 + x4 = 4

Solving
-16x2 + x4 = 4

Solving for variable 'x'.

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

Combine like terms: 4 + -4 = 0
-4 + -16x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -16x2 + 4 + x4 = 0 + 4

Reorder the terms:
-4 + 4 + -16x2 + x4 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -16x2 + x4 = 0 + 4
-16x2 + x4 = 0 + 4

Combine like terms: 0 + 4 = 4
-16x2 + x4 = 4

The x term is -16x2.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x2 + 64 + x4 = 4 + 64

Reorder the terms:
64 + -16x2 + x4 = 4 + 64

Combine like terms: 4 + 64 = 68
64 + -16x2 + x4 = 68

Factor a perfect square on the left side:
(x2 + -8)(x2 + -8) = 68

Calculate the square root of the right side: 8.246211251

Break this problem into two subproblems by setting 
(x2 + -8) equal to 8.246211251 and -8.246211251.

Subproblem 1

x2 + -8 = 8.246211251 Simplifying x2 + -8 = 8.246211251 Reorder the terms: -8 + x2 = 8.246211251 Solving -8 + x2 = 8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x2 = 8.246211251 + 8 Combine like terms: -8 + 8 = 0 0 + x2 = 8.246211251 + 8 x2 = 8.246211251 + 8 Combine like terms: 8.246211251 + 8 = 16.246211251 x2 = 16.246211251 Simplifying x2 = 16.246211251 Take the square root of each side: x = {-4.03065891, 4.03065891}

Subproblem 2

x2 + -8 = -8.246211251 Simplifying x2 + -8 = -8.246211251 Reorder the terms: -8 + x2 = -8.246211251 Solving -8 + x2 = -8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x2 = -8.246211251 + 8 Combine like terms: -8 + 8 = 0 0 + x2 = -8.246211251 + 8 x2 = -8.246211251 + 8 Combine like terms: -8.246211251 + 8 = -0.246211251 x2 = -0.246211251 Simplifying x2 = -0.246211251 Reorder the terms: 0.246211251 + x2 = -0.246211251 + 0.246211251 Combine like terms: -0.246211251 + 0.246211251 = 0.000000000 0.246211251 + 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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