x^4-6x^2-55=15

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Solution for x^4-6x^2-55=15 equation:


Simplifying
x4 + -6x2 + -55 = 15

Reorder the terms:
-55 + -6x2 + x4 = 15

Solving
-55 + -6x2 + x4 = 15

Solving for variable 'x'.

Reorder the terms:
-55 + -15 + -6x2 + x4 = 15 + -15

Combine like terms: -55 + -15 = -70
-70 + -6x2 + x4 = 15 + -15

Combine like terms: 15 + -15 = 0
-70 + -6x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + -6x2 + 70 + x4 = 0 + 70

Reorder the terms:
-70 + 70 + -6x2 + x4 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + -6x2 + x4 = 0 + 70
-6x2 + x4 = 0 + 70

Combine like terms: 0 + 70 = 70
-6x2 + x4 = 70

The x term is -6x2.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x2 + 9 + x4 = 70 + 9

Reorder the terms:
9 + -6x2 + x4 = 70 + 9

Combine like terms: 70 + 9 = 79
9 + -6x2 + x4 = 79

Factor a perfect square on the left side:
(x2 + -3)(x2 + -3) = 79

Calculate the square root of the right side: 8.888194417

Break this problem into two subproblems by setting 
(x2 + -3) equal to 8.888194417 and -8.888194417.

Subproblem 1

x2 + -3 = 8.888194417 Simplifying x2 + -3 = 8.888194417 Reorder the terms: -3 + x2 = 8.888194417 Solving -3 + x2 = 8.888194417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x2 = 8.888194417 + 3 Combine like terms: -3 + 3 = 0 0 + x2 = 8.888194417 + 3 x2 = 8.888194417 + 3 Combine like terms: 8.888194417 + 3 = 11.888194417 x2 = 11.888194417 Simplifying x2 = 11.888194417 Take the square root of each side: x = {-3.447926104, 3.447926104}

Subproblem 2

x2 + -3 = -8.888194417 Simplifying x2 + -3 = -8.888194417 Reorder the terms: -3 + x2 = -8.888194417 Solving -3 + x2 = -8.888194417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x2 = -8.888194417 + 3 Combine like terms: -3 + 3 = 0 0 + x2 = -8.888194417 + 3 x2 = -8.888194417 + 3 Combine like terms: -8.888194417 + 3 = -5.888194417 x2 = -5.888194417 Simplifying x2 = -5.888194417 Reorder the terms: 5.888194417 + x2 = -5.888194417 + 5.888194417 Combine like terms: -5.888194417 + 5.888194417 = 0.000000000 5.888194417 + 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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