8y^2+14y=5

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Solution for 8y^2+14y=5 equation:


Simplifying
8y2 + 14y = 5

Reorder the terms:
14y + 8y2 = 5

Solving
14y + 8y2 = 5

Solving for variable 'y'.

Reorder the terms:
-5 + 14y + 8y2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 14y + 8y2 = 0

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

Divide each side by '8'.
-0.625 + 1.75y + y2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 1.75y + 0.625 + y2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 1.75y + y2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 1.75y + y2 = 0 + 0.625
1.75y + y2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
1.75y + y2 = 0.625

The y term is 1.75y.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75y + 0.765625 + y2 = 0.625 + 0.765625

Reorder the terms:
0.765625 + 1.75y + y2 = 0.625 + 0.765625

Combine like terms: 0.625 + 0.765625 = 1.390625
0.765625 + 1.75y + y2 = 1.390625

Factor a perfect square on the left side:
(y + 0.875)(y + 0.875) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(y + 0.875) equal to 1.179247642 and -1.179247642.

Subproblem 1

y + 0.875 = 1.179247642 Simplifying y + 0.875 = 1.179247642 Reorder the terms: 0.875 + y = 1.179247642 Solving 0.875 + y = 1.179247642 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + y = 1.179247642 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = 1.179247642 + -0.875 y = 1.179247642 + -0.875 Combine like terms: 1.179247642 + -0.875 = 0.304247642 y = 0.304247642 Simplifying y = 0.304247642

Subproblem 2

y + 0.875 = -1.179247642 Simplifying y + 0.875 = -1.179247642 Reorder the terms: 0.875 + y = -1.179247642 Solving 0.875 + y = -1.179247642 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + y = -1.179247642 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = -1.179247642 + -0.875 y = -1.179247642 + -0.875 Combine like terms: -1.179247642 + -0.875 = -2.054247642 y = -2.054247642 Simplifying y = -2.054247642

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.304247642, -2.054247642}

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