x^4+2x^2-720=0

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Solution for x^4+2x^2-720=0 equation:


Simplifying
x4 + 2x2 + -720 = 0

Reorder the terms:
-720 + 2x2 + x4 = 0

Solving
-720 + 2x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '720' to each side of the equation.
-720 + 2x2 + 720 + x4 = 0 + 720

Reorder the terms:
-720 + 720 + 2x2 + x4 = 0 + 720

Combine like terms: -720 + 720 = 0
0 + 2x2 + x4 = 0 + 720
2x2 + x4 = 0 + 720

Combine like terms: 0 + 720 = 720
2x2 + x4 = 720

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 = 720 + 1

Reorder the terms:
1 + 2x2 + x4 = 720 + 1

Combine like terms: 720 + 1 = 721
1 + 2x2 + x4 = 721

Factor a perfect square on the left side:
(x2 + 1)(x2 + 1) = 721

Calculate the square root of the right side: 26.851443164

Break this problem into two subproblems by setting 
(x2 + 1) equal to 26.851443164 and -26.851443164.

Subproblem 1

x2 + 1 = 26.851443164 Simplifying x2 + 1 = 26.851443164 Reorder the terms: 1 + x2 = 26.851443164 Solving 1 + x2 = 26.851443164 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 = 26.851443164 + -1 Combine like terms: 1 + -1 = 0 0 + x2 = 26.851443164 + -1 x2 = 26.851443164 + -1 Combine like terms: 26.851443164 + -1 = 25.851443164 x2 = 25.851443164 Simplifying x2 = 25.851443164 Take the square root of each side: x = {-5.084431449, 5.084431449}

Subproblem 2

x2 + 1 = -26.851443164 Simplifying x2 + 1 = -26.851443164 Reorder the terms: 1 + x2 = -26.851443164 Solving 1 + x2 = -26.851443164 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 = -26.851443164 + -1 Combine like terms: 1 + -1 = 0 0 + x2 = -26.851443164 + -1 x2 = -26.851443164 + -1 Combine like terms: -26.851443164 + -1 = -27.851443164 x2 = -27.851443164 Simplifying x2 = -27.851443164 Reorder the terms: 27.851443164 + x2 = -27.851443164 + 27.851443164 Combine like terms: -27.851443164 + 27.851443164 = 0.000000000 27.851443164 + 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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