8y^2-1y+102y+4=

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Solution for 8y^2-1y+102y+4= equation:


Simplifying
8y2 + -1y + 102y + 4 = 0

Reorder the terms:
4 + -1y + 102y + 8y2 = 0

Combine like terms: -1y + 102y = 101y
4 + 101y + 8y2 = 0

Solving
4 + 101y + 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 + 12.625y + y2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 12.625y + -0.5 + y2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 12.625y + y2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 12.625y + y2 = 0 + -0.5
12.625y + y2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
12.625y + y2 = -0.5

The y term is 12.625y.  Take half its coefficient (6.3125).
Square it (39.84765625) and add it to both sides.

Add '39.84765625' to each side of the equation.
12.625y + 39.84765625 + y2 = -0.5 + 39.84765625

Reorder the terms:
39.84765625 + 12.625y + y2 = -0.5 + 39.84765625

Combine like terms: -0.5 + 39.84765625 = 39.34765625
39.84765625 + 12.625y + y2 = 39.34765625

Factor a perfect square on the left side:
(y + 6.3125)(y + 6.3125) = 39.34765625

Calculate the square root of the right side: 6.272771018

Break this problem into two subproblems by setting 
(y + 6.3125) equal to 6.272771018 and -6.272771018.

Subproblem 1

y + 6.3125 = 6.272771018 Simplifying y + 6.3125 = 6.272771018 Reorder the terms: 6.3125 + y = 6.272771018 Solving 6.3125 + y = 6.272771018 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.3125' to each side of the equation. 6.3125 + -6.3125 + y = 6.272771018 + -6.3125 Combine like terms: 6.3125 + -6.3125 = 0.0000 0.0000 + y = 6.272771018 + -6.3125 y = 6.272771018 + -6.3125 Combine like terms: 6.272771018 + -6.3125 = -0.039728982 y = -0.039728982 Simplifying y = -0.039728982

Subproblem 2

y + 6.3125 = -6.272771018 Simplifying y + 6.3125 = -6.272771018 Reorder the terms: 6.3125 + y = -6.272771018 Solving 6.3125 + y = -6.272771018 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6.3125' to each side of the equation. 6.3125 + -6.3125 + y = -6.272771018 + -6.3125 Combine like terms: 6.3125 + -6.3125 = 0.0000 0.0000 + y = -6.272771018 + -6.3125 y = -6.272771018 + -6.3125 Combine like terms: -6.272771018 + -6.3125 = -12.585271018 y = -12.585271018 Simplifying y = -12.585271018

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.039728982, -12.585271018}

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