y^4-8+5y^2=

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Solution for y^4-8+5y^2= equation:


Simplifying
y4 + -8 + 5y2 = 0

Reorder the terms:
-8 + 5y2 + y4 = 0

Solving
-8 + 5y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 5y2 + 8 + y4 = 0 + 8

Reorder the terms:
-8 + 8 + 5y2 + y4 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 5y2 + y4 = 0 + 8
5y2 + y4 = 0 + 8

Combine like terms: 0 + 8 = 8
5y2 + y4 = 8

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 = 8 + 6.25

Reorder the terms:
6.25 + 5y2 + y4 = 8 + 6.25

Combine like terms: 8 + 6.25 = 14.25
6.25 + 5y2 + y4 = 14.25

Factor a perfect square on the left side:
(y2 + 2.5)(y2 + 2.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(y2 + 2.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

y2 + 2.5 = 3.774917218 Simplifying y2 + 2.5 = 3.774917218 Reorder the terms: 2.5 + y2 = 3.774917218 Solving 2.5 + y2 = 3.774917218 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 = 3.774917218 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y2 = 3.774917218 + -2.5 y2 = 3.774917218 + -2.5 Combine like terms: 3.774917218 + -2.5 = 1.274917218 y2 = 1.274917218 Simplifying y2 = 1.274917218 Take the square root of each side: y = {-1.129122322, 1.129122322}

Subproblem 2

y2 + 2.5 = -3.774917218 Simplifying y2 + 2.5 = -3.774917218 Reorder the terms: 2.5 + y2 = -3.774917218 Solving 2.5 + y2 = -3.774917218 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 = -3.774917218 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y2 = -3.774917218 + -2.5 y2 = -3.774917218 + -2.5 Combine like terms: -3.774917218 + -2.5 = -6.274917218 y2 = -6.274917218 Simplifying y2 = -6.274917218 Reorder the terms: 6.274917218 + y2 = -6.274917218 + 6.274917218 Combine like terms: -6.274917218 + 6.274917218 = 0.000000000 6.274917218 + 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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