-y^4-13y^2+36=0

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Solution for -y^4-13y^2+36=0 equation:


Simplifying
-1y4 + -13y2 + 36 = 0

Reorder the terms:
36 + -13y2 + -1y4 = 0

Solving
36 + -13y2 + -1y4 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-36 + 13y2 + y4 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 13y2 + 36 + y4 = 0 + 36

Reorder the terms:
-36 + 36 + 13y2 + y4 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 13y2 + y4 = 0 + 36
13y2 + y4 = 0 + 36

Combine like terms: 0 + 36 = 36
13y2 + y4 = 36

The y term is 13y2.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13y2 + 42.25 + y4 = 36 + 42.25

Reorder the terms:
42.25 + 13y2 + y4 = 36 + 42.25

Combine like terms: 36 + 42.25 = 78.25
42.25 + 13y2 + y4 = 78.25

Factor a perfect square on the left side:
(y2 + 6.5)(y2 + 6.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(y2 + 6.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

y2 + 6.5 = 8.845903006 Simplifying y2 + 6.5 = 8.845903006 Reorder the terms: 6.5 + y2 = 8.845903006 Solving 6.5 + y2 = 8.845903006 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + y2 = 8.845903006 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + y2 = 8.845903006 + -6.5 y2 = 8.845903006 + -6.5 Combine like terms: 8.845903006 + -6.5 = 2.345903006 y2 = 2.345903006 Simplifying y2 = 2.345903006 Take the square root of each side: y = {-1.531634097, 1.531634097}

Subproblem 2

y2 + 6.5 = -8.845903006 Simplifying y2 + 6.5 = -8.845903006 Reorder the terms: 6.5 + y2 = -8.845903006 Solving 6.5 + y2 = -8.845903006 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + y2 = -8.845903006 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + y2 = -8.845903006 + -6.5 y2 = -8.845903006 + -6.5 Combine like terms: -8.845903006 + -6.5 = -15.345903006 y2 = -15.345903006 Simplifying y2 = -15.345903006 Reorder the terms: 15.345903006 + y2 = -15.345903006 + 15.345903006 Combine like terms: -15.345903006 + 15.345903006 = 0.000000000 15.345903006 + 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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