y^4+6y^2-4=0

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Solution for y^4+6y^2-4=0 equation:


Simplifying
y4 + 6y2 + -4 = 0

Reorder the terms:
-4 + 6y2 + y4 = 0

Solving
-4 + 6y2 + 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 + 6y2 + 4 + y4 = 0 + 4

Reorder the terms:
-4 + 4 + 6y2 + y4 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 6y2 + y4 = 0 + 4
6y2 + y4 = 0 + 4

Combine like terms: 0 + 4 = 4
6y2 + y4 = 4

The y term is 6y2.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6y2 + 9 + y4 = 4 + 9

Reorder the terms:
9 + 6y2 + y4 = 4 + 9

Combine like terms: 4 + 9 = 13
9 + 6y2 + y4 = 13

Factor a perfect square on the left side:
(y2 + 3)(y2 + 3) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(y2 + 3) equal to 3.605551275 and -3.605551275.

Subproblem 1

y2 + 3 = 3.605551275 Simplifying y2 + 3 = 3.605551275 Reorder the terms: 3 + y2 = 3.605551275 Solving 3 + y2 = 3.605551275 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y2 = 3.605551275 + -3 Combine like terms: 3 + -3 = 0 0 + y2 = 3.605551275 + -3 y2 = 3.605551275 + -3 Combine like terms: 3.605551275 + -3 = 0.605551275 y2 = 0.605551275 Simplifying y2 = 0.605551275 Take the square root of each side: y = {-0.778171752, 0.778171752}

Subproblem 2

y2 + 3 = -3.605551275 Simplifying y2 + 3 = -3.605551275 Reorder the terms: 3 + y2 = -3.605551275 Solving 3 + y2 = -3.605551275 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y2 = -3.605551275 + -3 Combine like terms: 3 + -3 = 0 0 + y2 = -3.605551275 + -3 y2 = -3.605551275 + -3 Combine like terms: -3.605551275 + -3 = -6.605551275 y2 = -6.605551275 Simplifying y2 = -6.605551275 Reorder the terms: 6.605551275 + y2 = -6.605551275 + 6.605551275 Combine like terms: -6.605551275 + 6.605551275 = 0.000000000 6.605551275 + 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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