y^4+y^2-22=0

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Solution for y^4+y^2-22=0 equation:


Simplifying
y4 + y2 + -22 = 0

Reorder the terms:
-22 + y2 + y4 = 0

Solving
-22 + y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '22' to each side of the equation.
-22 + y2 + 22 + y4 = 0 + 22

Reorder the terms:
-22 + 22 + y2 + y4 = 0 + 22

Combine like terms: -22 + 22 = 0
0 + y2 + y4 = 0 + 22
y2 + y4 = 0 + 22

Combine like terms: 0 + 22 = 22
y2 + y4 = 22

The y term is y2.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
y2 + 0.25 + y4 = 22 + 0.25

Reorder the terms:
0.25 + y2 + y4 = 22 + 0.25

Combine like terms: 22 + 0.25 = 22.25
0.25 + y2 + y4 = 22.25

Factor a perfect square on the left side:
(y2 + 0.5)(y2 + 0.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(y2 + 0.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

y2 + 0.5 = 4.716990566 Simplifying y2 + 0.5 = 4.716990566 Reorder the terms: 0.5 + y2 = 4.716990566 Solving 0.5 + y2 = 4.716990566 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y2 = 4.716990566 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y2 = 4.716990566 + -0.5 y2 = 4.716990566 + -0.5 Combine like terms: 4.716990566 + -0.5 = 4.216990566 y2 = 4.216990566 Simplifying y2 = 4.216990566 Take the square root of each side: y = {-2.053531243, 2.053531243}

Subproblem 2

y2 + 0.5 = -4.716990566 Simplifying y2 + 0.5 = -4.716990566 Reorder the terms: 0.5 + y2 = -4.716990566 Solving 0.5 + y2 = -4.716990566 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y2 = -4.716990566 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y2 = -4.716990566 + -0.5 y2 = -4.716990566 + -0.5 Combine like terms: -4.716990566 + -0.5 = -5.216990566 y2 = -5.216990566 Simplifying y2 = -5.216990566 Reorder the terms: 5.216990566 + y2 = -5.216990566 + 5.216990566 Combine like terms: -5.216990566 + 5.216990566 = 0.000000000 5.216990566 + 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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