y^4+9y^2-100=0

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Solution for y^4+9y^2-100=0 equation:


Simplifying
y4 + 9y2 + -100 = 0

Reorder the terms:
-100 + 9y2 + y4 = 0

Solving
-100 + 9y2 + y4 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 9y2 + 100 + y4 = 0 + 100

Reorder the terms:
-100 + 100 + 9y2 + y4 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 9y2 + y4 = 0 + 100
9y2 + y4 = 0 + 100

Combine like terms: 0 + 100 = 100
9y2 + y4 = 100

The y term is 9y2.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9y2 + 20.25 + y4 = 100 + 20.25

Reorder the terms:
20.25 + 9y2 + y4 = 100 + 20.25

Combine like terms: 100 + 20.25 = 120.25
20.25 + 9y2 + y4 = 120.25

Factor a perfect square on the left side:
(y2 + 4.5)(y2 + 4.5) = 120.25

Calculate the square root of the right side: 10.9658561

Break this problem into two subproblems by setting 
(y2 + 4.5) equal to 10.9658561 and -10.9658561.

Subproblem 1

y2 + 4.5 = 10.9658561 Simplifying y2 + 4.5 = 10.9658561 Reorder the terms: 4.5 + y2 = 10.9658561 Solving 4.5 + y2 = 10.9658561 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + y2 = 10.9658561 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + y2 = 10.9658561 + -4.5 y2 = 10.9658561 + -4.5 Combine like terms: 10.9658561 + -4.5 = 6.4658561 y2 = 6.4658561 Simplifying y2 = 6.4658561 Take the square root of each side: y = {-2.54280477, 2.54280477}

Subproblem 2

y2 + 4.5 = -10.9658561 Simplifying y2 + 4.5 = -10.9658561 Reorder the terms: 4.5 + y2 = -10.9658561 Solving 4.5 + y2 = -10.9658561 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + y2 = -10.9658561 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + y2 = -10.9658561 + -4.5 y2 = -10.9658561 + -4.5 Combine like terms: -10.9658561 + -4.5 = -15.4658561 y2 = -15.4658561 Simplifying y2 = -15.4658561 Reorder the terms: 15.4658561 + y2 = -15.4658561 + 15.4658561 Combine like terms: -15.4658561 + 15.4658561 = 0.0000000 15.4658561 + y2 = 0.0000000 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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