y^4+2y^2-117=0

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Solution for y^4+2y^2-117=0 equation:


Simplifying
y4 + 2y2 + -117 = 0

Reorder the terms:
-117 + 2y2 + y4 = 0

Solving
-117 + 2y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '117' to each side of the equation.
-117 + 2y2 + 117 + y4 = 0 + 117

Reorder the terms:
-117 + 117 + 2y2 + y4 = 0 + 117

Combine like terms: -117 + 117 = 0
0 + 2y2 + y4 = 0 + 117
2y2 + y4 = 0 + 117

Combine like terms: 0 + 117 = 117
2y2 + y4 = 117

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 = 117 + 1

Reorder the terms:
1 + 2y2 + y4 = 117 + 1

Combine like terms: 117 + 1 = 118
1 + 2y2 + y4 = 118

Factor a perfect square on the left side:
(y2 + 1)(y2 + 1) = 118

Calculate the square root of the right side: 10.862780491

Break this problem into two subproblems by setting 
(y2 + 1) equal to 10.862780491 and -10.862780491.

Subproblem 1

y2 + 1 = 10.862780491 Simplifying y2 + 1 = 10.862780491 Reorder the terms: 1 + y2 = 10.862780491 Solving 1 + y2 = 10.862780491 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 = 10.862780491 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = 10.862780491 + -1 y2 = 10.862780491 + -1 Combine like terms: 10.862780491 + -1 = 9.862780491 y2 = 9.862780491 Simplifying y2 = 9.862780491 Take the square root of each side: y = {-3.140506407, 3.140506407}

Subproblem 2

y2 + 1 = -10.862780491 Simplifying y2 + 1 = -10.862780491 Reorder the terms: 1 + y2 = -10.862780491 Solving 1 + y2 = -10.862780491 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 = -10.862780491 + -1 Combine like terms: 1 + -1 = 0 0 + y2 = -10.862780491 + -1 y2 = -10.862780491 + -1 Combine like terms: -10.862780491 + -1 = -11.862780491 y2 = -11.862780491 Simplifying y2 = -11.862780491 Reorder the terms: 11.862780491 + y2 = -11.862780491 + 11.862780491 Combine like terms: -11.862780491 + 11.862780491 = 0.000000000 11.862780491 + 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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