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

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


Simplifying
x4 + -2x2 + -45 = 0

Reorder the terms:
-45 + -2x2 + x4 = 0

Solving
-45 + -2x2 + 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 + -2x2 + 45 + x4 = 0 + 45

Reorder the terms:
-45 + 45 + -2x2 + x4 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -2x2 + x4 = 0 + 45
-2x2 + x4 = 0 + 45

Combine like terms: 0 + 45 = 45
-2x2 + x4 = 45

The x term is -2x2.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x2 + 1 + x4 = 45 + 1

Reorder the terms:
1 + -2x2 + x4 = 45 + 1

Combine like terms: 45 + 1 = 46
1 + -2x2 + x4 = 46

Factor a perfect square on the left side:
(x2 + -1)(x2 + -1) = 46

Calculate the square root of the right side: 6.782329983

Break this problem into two subproblems by setting 
(x2 + -1) equal to 6.782329983 and -6.782329983.

Subproblem 1

x2 + -1 = 6.782329983 Simplifying x2 + -1 = 6.782329983 Reorder the terms: -1 + x2 = 6.782329983 Solving -1 + x2 = 6.782329983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = 6.782329983 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = 6.782329983 + 1 x2 = 6.782329983 + 1 Combine like terms: 6.782329983 + 1 = 7.782329983 x2 = 7.782329983 Simplifying x2 = 7.782329983 Take the square root of each side: x = {-2.789682775, 2.789682775}

Subproblem 2

x2 + -1 = -6.782329983 Simplifying x2 + -1 = -6.782329983 Reorder the terms: -1 + x2 = -6.782329983 Solving -1 + x2 = -6.782329983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = -6.782329983 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = -6.782329983 + 1 x2 = -6.782329983 + 1 Combine like terms: -6.782329983 + 1 = -5.782329983 x2 = -5.782329983 Simplifying x2 = -5.782329983 Reorder the terms: 5.782329983 + x2 = -5.782329983 + 5.782329983 Combine like terms: -5.782329983 + 5.782329983 = 0.000000000 5.782329983 + 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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