y^4+2y^2-20=0

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Solution for y^4+2y^2-20=0 equation:


Simplifying
y4 + 2y2 + -20 = 0

Reorder the terms:
-20 + 2y2 + y4 = 0

Solving
-20 + 2y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 2y2 + 20 + y4 = 0 + 20

Reorder the terms:
-20 + 20 + 2y2 + y4 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 2y2 + y4 = 0 + 20
2y2 + y4 = 0 + 20

Combine like terms: 0 + 20 = 20
2y2 + y4 = 20

The y term is 2y2.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y2 + 1 + y4 = 20 + 1

Reorder the terms:
1 + 2y2 + y4 = 20 + 1

Combine like terms: 20 + 1 = 21
1 + 2y2 + y4 = 21

Factor a perfect square on the left side:
(y2 + 1)(y2 + 1) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(y2 + 1) equal to 4.582575695 and -4.582575695.

Subproblem 1

y2 + 1 = 4.582575695 Simplifying y2 + 1 = 4.582575695 Reorder the terms: 1 + y2 = 4.582575695 Solving 1 + y2 = 4.582575695 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y2 = 4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = 4.582575695 + -1 y2 = 4.582575695 + -1 Combine like terms: 4.582575695 + -1 = 3.582575695 y2 = 3.582575695 Simplifying y2 = 3.582575695 Take the square root of each side: y = {-1.892769319, 1.892769319}

Subproblem 2

y2 + 1 = -4.582575695 Simplifying y2 + 1 = -4.582575695 Reorder the terms: 1 + y2 = -4.582575695 Solving 1 + y2 = -4.582575695 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y2 = -4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = -4.582575695 + -1 y2 = -4.582575695 + -1 Combine like terms: -4.582575695 + -1 = -5.582575695 y2 = -5.582575695 Simplifying y2 = -5.582575695 Reorder the terms: 5.582575695 + y2 = -5.582575695 + 5.582575695 Combine like terms: -5.582575695 + 5.582575695 = 0.000000000 5.582575695 + y2 = 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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