x^4-22x^2-45=0

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Solution for x^4-22x^2-45=0 equation:


Simplifying
x4 + -22x2 + -45 = 0

Reorder the terms:
-45 + -22x2 + x4 = 0

Solving
-45 + -22x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -22x2 + 45 + x4 = 0 + 45

Reorder the terms:
-45 + 45 + -22x2 + x4 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -22x2 + x4 = 0 + 45
-22x2 + x4 = 0 + 45

Combine like terms: 0 + 45 = 45
-22x2 + x4 = 45

The x term is -22x2.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22x2 + 121 + x4 = 45 + 121

Reorder the terms:
121 + -22x2 + x4 = 45 + 121

Combine like terms: 45 + 121 = 166
121 + -22x2 + x4 = 166

Factor a perfect square on the left side:
(x2 + -11)(x2 + -11) = 166

Calculate the square root of the right side: 12.884098727

Break this problem into two subproblems by setting 
(x2 + -11) equal to 12.884098727 and -12.884098727.

Subproblem 1

x2 + -11 = 12.884098727 Simplifying x2 + -11 = 12.884098727 Reorder the terms: -11 + x2 = 12.884098727 Solving -11 + x2 = 12.884098727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x2 = 12.884098727 + 11 Combine like terms: -11 + 11 = 0 0 + x2 = 12.884098727 + 11 x2 = 12.884098727 + 11 Combine like terms: 12.884098727 + 11 = 23.884098727 x2 = 23.884098727 Simplifying x2 = 23.884098727 Take the square root of each side: x = {-4.887136045, 4.887136045}

Subproblem 2

x2 + -11 = -12.884098727 Simplifying x2 + -11 = -12.884098727 Reorder the terms: -11 + x2 = -12.884098727 Solving -11 + x2 = -12.884098727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x2 = -12.884098727 + 11 Combine like terms: -11 + 11 = 0 0 + x2 = -12.884098727 + 11 x2 = -12.884098727 + 11 Combine like terms: -12.884098727 + 11 = -1.884098727 x2 = -1.884098727 Simplifying x2 = -1.884098727 Reorder the terms: 1.884098727 + x2 = -1.884098727 + 1.884098727 Combine like terms: -1.884098727 + 1.884098727 = 0.000000000 1.884098727 + 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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