8y^4+3=12y^2

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Solution for 8y^4+3=12y^2 equation:


Simplifying
8y4 + 3 = 12y2

Reorder the terms:
3 + 8y4 = 12y2

Solving
3 + 8y4 = 12y2

Solving for variable 'y'.

Reorder the terms:
3 + -12y2 + 8y4 = 12y2 + -12y2

Combine like terms: 12y2 + -12y2 = 0
3 + -12y2 + 8y4 = 0

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
0.375 + -1.5y2 + y4 = 0

Move the constant term to the right:

Add '-0.375' to each side of the equation.
0.375 + -1.5y2 + -0.375 + y4 = 0 + -0.375

Reorder the terms:
0.375 + -0.375 + -1.5y2 + y4 = 0 + -0.375

Combine like terms: 0.375 + -0.375 = 0.000
0.000 + -1.5y2 + y4 = 0 + -0.375
-1.5y2 + y4 = 0 + -0.375

Combine like terms: 0 + -0.375 = -0.375
-1.5y2 + y4 = -0.375

The y term is -1.5y2.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5y2 + 0.5625 + y4 = -0.375 + 0.5625

Reorder the terms:
0.5625 + -1.5y2 + y4 = -0.375 + 0.5625

Combine like terms: -0.375 + 0.5625 = 0.1875
0.5625 + -1.5y2 + y4 = 0.1875

Factor a perfect square on the left side:
(y2 + -0.75)(y2 + -0.75) = 0.1875

Calculate the square root of the right side: 0.433012702

Break this problem into two subproblems by setting 
(y2 + -0.75) equal to 0.433012702 and -0.433012702.

Subproblem 1

y2 + -0.75 = 0.433012702 Simplifying y2 + -0.75 = 0.433012702 Reorder the terms: -0.75 + y2 = 0.433012702 Solving -0.75 + y2 = 0.433012702 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y2 = 0.433012702 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y2 = 0.433012702 + 0.75 y2 = 0.433012702 + 0.75 Combine like terms: 0.433012702 + 0.75 = 1.183012702 y2 = 1.183012702 Simplifying y2 = 1.183012702 Take the square root of each side: y = {-1.087663874, 1.087663874}

Subproblem 2

y2 + -0.75 = -0.433012702 Simplifying y2 + -0.75 = -0.433012702 Reorder the terms: -0.75 + y2 = -0.433012702 Solving -0.75 + y2 = -0.433012702 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y2 = -0.433012702 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y2 = -0.433012702 + 0.75 y2 = -0.433012702 + 0.75 Combine like terms: -0.433012702 + 0.75 = 0.316987298 y2 = 0.316987298 Simplifying y2 = 0.316987298 Take the square root of each side: y = {-0.56301625, 0.56301625}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.087663874, 1.087663874, -0.56301625, 0.56301625}

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