y^4-6y^2-9=0

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Solution for y^4-6y^2-9=0 equation:


Simplifying
y4 + -6y2 + -9 = 0

Reorder the terms:
-9 + -6y2 + y4 = 0

Solving
-9 + -6y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -6y2 + 9 + y4 = 0 + 9

Reorder the terms:
-9 + 9 + -6y2 + y4 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -6y2 + y4 = 0 + 9
-6y2 + y4 = 0 + 9

Combine like terms: 0 + 9 = 9
-6y2 + y4 = 9

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 = 9 + 9

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

Combine like terms: 9 + 9 = 18
9 + -6y2 + y4 = 18

Factor a perfect square on the left side:
(y2 + -3)(y2 + -3) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(y2 + -3) equal to 4.242640687 and -4.242640687.

Subproblem 1

y2 + -3 = 4.242640687 Simplifying y2 + -3 = 4.242640687 Reorder the terms: -3 + y2 = 4.242640687 Solving -3 + y2 = 4.242640687 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 = 4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + y2 = 4.242640687 + 3 y2 = 4.242640687 + 3 Combine like terms: 4.242640687 + 3 = 7.242640687 y2 = 7.242640687 Simplifying y2 = 7.242640687 Take the square root of each side: y = {-2.691215466, 2.691215466}

Subproblem 2

y2 + -3 = -4.242640687 Simplifying y2 + -3 = -4.242640687 Reorder the terms: -3 + y2 = -4.242640687 Solving -3 + y2 = -4.242640687 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 = -4.242640687 + 3 Combine like terms: -3 + 3 = 0 0 + y2 = -4.242640687 + 3 y2 = -4.242640687 + 3 Combine like terms: -4.242640687 + 3 = -1.242640687 y2 = -1.242640687 Simplifying y2 = -1.242640687 Reorder the terms: 1.242640687 + y2 = -1.242640687 + 1.242640687 Combine like terms: -1.242640687 + 1.242640687 = 0.000000000 1.242640687 + 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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