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

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


Simplifying
y4 + -2y2 + -6 = 0

Reorder the terms:
-6 + -2y2 + y4 = 0

Solving
-6 + -2y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -2y2 + 6 + y4 = 0 + 6

Reorder the terms:
-6 + 6 + -2y2 + y4 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -2y2 + y4 = 0 + 6
-2y2 + y4 = 0 + 6

Combine like terms: 0 + 6 = 6
-2y2 + y4 = 6

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 = 6 + 1

Reorder the terms:
1 + -2y2 + y4 = 6 + 1

Combine like terms: 6 + 1 = 7
1 + -2y2 + y4 = 7

Factor a perfect square on the left side:
(y2 + -1)(y2 + -1) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(y2 + -1) equal to 2.645751311 and -2.645751311.

Subproblem 1

y2 + -1 = 2.645751311 Simplifying y2 + -1 = 2.645751311 Reorder the terms: -1 + y2 = 2.645751311 Solving -1 + y2 = 2.645751311 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 = 2.645751311 + 1 Combine like terms: -1 + 1 = 0 0 + y2 = 2.645751311 + 1 y2 = 2.645751311 + 1 Combine like terms: 2.645751311 + 1 = 3.645751311 y2 = 3.645751311 Simplifying y2 = 3.645751311 Take the square root of each side: y = {-1.909385061, 1.909385061}

Subproblem 2

y2 + -1 = -2.645751311 Simplifying y2 + -1 = -2.645751311 Reorder the terms: -1 + y2 = -2.645751311 Solving -1 + y2 = -2.645751311 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 = -2.645751311 + 1 Combine like terms: -1 + 1 = 0 0 + y2 = -2.645751311 + 1 y2 = -2.645751311 + 1 Combine like terms: -2.645751311 + 1 = -1.645751311 y2 = -1.645751311 Simplifying y2 = -1.645751311 Reorder the terms: 1.645751311 + y2 = -1.645751311 + 1.645751311 Combine like terms: -1.645751311 + 1.645751311 = 0.000000000 1.645751311 + 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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