3y-8y^2+4=0

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Solution for 3y-8y^2+4=0 equation:


Simplifying
3y + -8y2 + 4 = 0

Reorder the terms:
4 + 3y + -8y2 = 0

Solving
4 + 3y + -8y2 = 0

Solving for variable 'y'.

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

Divide each side by '-8'.
-0.5 + -0.375y + y2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -0.375y + 0.5 + y2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -0.375y + y2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -0.375y + y2 = 0 + 0.5
-0.375y + y2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-0.375y + y2 = 0.5

The y term is -0.375y.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375y + 0.03515625 + y2 = 0.5 + 0.03515625

Reorder the terms:
0.03515625 + -0.375y + y2 = 0.5 + 0.03515625

Combine like terms: 0.5 + 0.03515625 = 0.53515625
0.03515625 + -0.375y + y2 = 0.53515625

Factor a perfect square on the left side:
(y + -0.1875)(y + -0.1875) = 0.53515625

Calculate the square root of the right side: 0.731543744

Break this problem into two subproblems by setting 
(y + -0.1875) equal to 0.731543744 and -0.731543744.

Subproblem 1

y + -0.1875 = 0.731543744 Simplifying y + -0.1875 = 0.731543744 Reorder the terms: -0.1875 + y = 0.731543744 Solving -0.1875 + y = 0.731543744 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + y = 0.731543744 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + y = 0.731543744 + 0.1875 y = 0.731543744 + 0.1875 Combine like terms: 0.731543744 + 0.1875 = 0.919043744 y = 0.919043744 Simplifying y = 0.919043744

Subproblem 2

y + -0.1875 = -0.731543744 Simplifying y + -0.1875 = -0.731543744 Reorder the terms: -0.1875 + y = -0.731543744 Solving -0.1875 + y = -0.731543744 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + y = -0.731543744 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + y = -0.731543744 + 0.1875 y = -0.731543744 + 0.1875 Combine like terms: -0.731543744 + 0.1875 = -0.544043744 y = -0.544043744 Simplifying y = -0.544043744

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.919043744, -0.544043744}

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