x^4-16x^2-39=0

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Solution for x^4-16x^2-39=0 equation:


Simplifying
x4 + -16x2 + -39 = 0

Reorder the terms:
-39 + -16x2 + x4 = 0

Solving
-39 + -16x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + -16x2 + 39 + x4 = 0 + 39

Reorder the terms:
-39 + 39 + -16x2 + x4 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + -16x2 + x4 = 0 + 39
-16x2 + x4 = 0 + 39

Combine like terms: 0 + 39 = 39
-16x2 + x4 = 39

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 = 39 + 64

Reorder the terms:
64 + -16x2 + x4 = 39 + 64

Combine like terms: 39 + 64 = 103
64 + -16x2 + x4 = 103

Factor a perfect square on the left side:
(x2 + -8)(x2 + -8) = 103

Calculate the square root of the right side: 10.148891565

Break this problem into two subproblems by setting 
(x2 + -8) equal to 10.148891565 and -10.148891565.

Subproblem 1

x2 + -8 = 10.148891565 Simplifying x2 + -8 = 10.148891565 Reorder the terms: -8 + x2 = 10.148891565 Solving -8 + x2 = 10.148891565 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 = 10.148891565 + 8 Combine like terms: -8 + 8 = 0 0 + x2 = 10.148891565 + 8 x2 = 10.148891565 + 8 Combine like terms: 10.148891565 + 8 = 18.148891565 x2 = 18.148891565 Simplifying x2 = 18.148891565 Take the square root of each side: x = {-4.260151589, 4.260151589}

Subproblem 2

x2 + -8 = -10.148891565 Simplifying x2 + -8 = -10.148891565 Reorder the terms: -8 + x2 = -10.148891565 Solving -8 + x2 = -10.148891565 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 = -10.148891565 + 8 Combine like terms: -8 + 8 = 0 0 + x2 = -10.148891565 + 8 x2 = -10.148891565 + 8 Combine like terms: -10.148891565 + 8 = -2.148891565 x2 = -2.148891565 Simplifying x2 = -2.148891565 Reorder the terms: 2.148891565 + x2 = -2.148891565 + 2.148891565 Combine like terms: -2.148891565 + 2.148891565 = 0.000000000 2.148891565 + 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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