y^2(y^2-4)=3y^2-4

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Solution for y^2(y^2-4)=3y^2-4 equation:


Simplifying
y2(y2 + -4) = 3y2 + -4

Reorder the terms:
y2(-4 + y2) = 3y2 + -4
(-4 * y2 + y2 * y2) = 3y2 + -4
(-4y2 + y4) = 3y2 + -4

Reorder the terms:
-4y2 + y4 = -4 + 3y2

Solving
-4y2 + y4 = -4 + 3y2

Solving for variable 'y'.

Reorder the terms:
4 + -4y2 + -3y2 + y4 = -4 + 3y2 + 4 + -3y2

Combine like terms: -4y2 + -3y2 = -7y2
4 + -7y2 + y4 = -4 + 3y2 + 4 + -3y2

Reorder the terms:
4 + -7y2 + y4 = -4 + 4 + 3y2 + -3y2

Combine like terms: -4 + 4 = 0
4 + -7y2 + y4 = 0 + 3y2 + -3y2
4 + -7y2 + y4 = 3y2 + -3y2

Combine like terms: 3y2 + -3y2 = 0
4 + -7y2 + y4 = 0

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -7y2 + -4 + y4 = 0 + -4

Reorder the terms:
4 + -4 + -7y2 + y4 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -7y2 + y4 = 0 + -4
-7y2 + y4 = 0 + -4

Combine like terms: 0 + -4 = -4
-7y2 + y4 = -4

The y term is -7y2.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y2 + 12.25 + y4 = -4 + 12.25

Reorder the terms:
12.25 + -7y2 + y4 = -4 + 12.25

Combine like terms: -4 + 12.25 = 8.25
12.25 + -7y2 + y4 = 8.25

Factor a perfect square on the left side:
(y2 + -3.5)(y2 + -3.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(y2 + -3.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

y2 + -3.5 = 2.872281323 Simplifying y2 + -3.5 = 2.872281323 Reorder the terms: -3.5 + y2 = 2.872281323 Solving -3.5 + y2 = 2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y2 = 2.872281323 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y2 = 2.872281323 + 3.5 y2 = 2.872281323 + 3.5 Combine like terms: 2.872281323 + 3.5 = 6.372281323 y2 = 6.372281323 Simplifying y2 = 6.372281323 Take the square root of each side: y = {-2.524337799, 2.524337799}

Subproblem 2

y2 + -3.5 = -2.872281323 Simplifying y2 + -3.5 = -2.872281323 Reorder the terms: -3.5 + y2 = -2.872281323 Solving -3.5 + y2 = -2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y2 = -2.872281323 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y2 = -2.872281323 + 3.5 y2 = -2.872281323 + 3.5 Combine like terms: -2.872281323 + 3.5 = 0.627718677 y2 = 0.627718677 Simplifying y2 = 0.627718677 Take the square root of each side: y = {-0.792286992, 0.792286992}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-2.524337799, 2.524337799, -0.792286992, 0.792286992}

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