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

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


Simplifying
y4 + 2y2 + -4 = 0

Reorder the terms:
-4 + 2y2 + y4 = 0

Solving
-4 + 2y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 2y2 + 4 + y4 = 0 + 4

Reorder the terms:
-4 + 4 + 2y2 + y4 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 2y2 + y4 = 0 + 4
2y2 + y4 = 0 + 4

Combine like terms: 0 + 4 = 4
2y2 + y4 = 4

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 = 4 + 1

Reorder the terms:
1 + 2y2 + y4 = 4 + 1

Combine like terms: 4 + 1 = 5
1 + 2y2 + y4 = 5

Factor a perfect square on the left side:
(y2 + 1)(y2 + 1) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(y2 + 1) equal to 2.236067978 and -2.236067978.

Subproblem 1

y2 + 1 = 2.236067978 Simplifying y2 + 1 = 2.236067978 Reorder the terms: 1 + y2 = 2.236067978 Solving 1 + y2 = 2.236067978 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 = 2.236067978 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = 2.236067978 + -1 y2 = 2.236067978 + -1 Combine like terms: 2.236067978 + -1 = 1.236067978 y2 = 1.236067978 Simplifying y2 = 1.236067978 Take the square root of each side: y = {-1.111785941, 1.111785941}

Subproblem 2

y2 + 1 = -2.236067978 Simplifying y2 + 1 = -2.236067978 Reorder the terms: 1 + y2 = -2.236067978 Solving 1 + y2 = -2.236067978 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 = -2.236067978 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = -2.236067978 + -1 y2 = -2.236067978 + -1 Combine like terms: -2.236067978 + -1 = -3.236067978 y2 = -3.236067978 Simplifying y2 = -3.236067978 Reorder the terms: 3.236067978 + y2 = -3.236067978 + 3.236067978 Combine like terms: -3.236067978 + 3.236067978 = 0.000000000 3.236067978 + 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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