y^4-5y^2-12=0

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Solution for y^4-5y^2-12=0 equation:


Simplifying
y4 + -5y2 + -12 = 0

Reorder the terms:
-12 + -5y2 + y4 = 0

Solving
-12 + -5y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -5y2 + 12 + y4 = 0 + 12

Reorder the terms:
-12 + 12 + -5y2 + y4 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -5y2 + y4 = 0 + 12
-5y2 + y4 = 0 + 12

Combine like terms: 0 + 12 = 12
-5y2 + y4 = 12

The y term is -5y2.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y2 + 6.25 + y4 = 12 + 6.25

Reorder the terms:
6.25 + -5y2 + y4 = 12 + 6.25

Combine like terms: 12 + 6.25 = 18.25
6.25 + -5y2 + y4 = 18.25

Factor a perfect square on the left side:
(y2 + -2.5)(y2 + -2.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(y2 + -2.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

y2 + -2.5 = 4.272001873 Simplifying y2 + -2.5 = 4.272001873 Reorder the terms: -2.5 + y2 = 4.272001873 Solving -2.5 + y2 = 4.272001873 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y2 = 4.272001873 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y2 = 4.272001873 + 2.5 y2 = 4.272001873 + 2.5 Combine like terms: 4.272001873 + 2.5 = 6.772001873 y2 = 6.772001873 Simplifying y2 = 6.772001873 Take the square root of each side: y = {-2.602307029, 2.602307029}

Subproblem 2

y2 + -2.5 = -4.272001873 Simplifying y2 + -2.5 = -4.272001873 Reorder the terms: -2.5 + y2 = -4.272001873 Solving -2.5 + y2 = -4.272001873 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y2 = -4.272001873 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y2 = -4.272001873 + 2.5 y2 = -4.272001873 + 2.5 Combine like terms: -4.272001873 + 2.5 = -1.772001873 y2 = -1.772001873 Simplifying y2 = -1.772001873 Reorder the terms: 1.772001873 + y2 = -1.772001873 + 1.772001873 Combine like terms: -1.772001873 + 1.772001873 = 0.000000000 1.772001873 + 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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