2y^2-17y-1=0

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Solution for 2y^2-17y-1=0 equation:


Simplifying
2y2 + -17y + -1 = 0

Reorder the terms:
-1 + -17y + 2y2 = 0

Solving
-1 + -17y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-0.5 + -8.5y + y2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -8.5y + 0.5 + y2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -8.5y + y2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -8.5y + y2 = 0 + 0.5
-8.5y + y2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-8.5y + y2 = 0.5

The y term is -8.5y.  Take half its coefficient (-4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
-8.5y + 18.0625 + y2 = 0.5 + 18.0625

Reorder the terms:
18.0625 + -8.5y + y2 = 0.5 + 18.0625

Combine like terms: 0.5 + 18.0625 = 18.5625
18.0625 + -8.5y + y2 = 18.5625

Factor a perfect square on the left side:
(y + -4.25)(y + -4.25) = 18.5625

Calculate the square root of the right side: 4.308421985

Break this problem into two subproblems by setting 
(y + -4.25) equal to 4.308421985 and -4.308421985.

Subproblem 1

y + -4.25 = 4.308421985 Simplifying y + -4.25 = 4.308421985 Reorder the terms: -4.25 + y = 4.308421985 Solving -4.25 + y = 4.308421985 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + y = 4.308421985 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + y = 4.308421985 + 4.25 y = 4.308421985 + 4.25 Combine like terms: 4.308421985 + 4.25 = 8.558421985 y = 8.558421985 Simplifying y = 8.558421985

Subproblem 2

y + -4.25 = -4.308421985 Simplifying y + -4.25 = -4.308421985 Reorder the terms: -4.25 + y = -4.308421985 Solving -4.25 + y = -4.308421985 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.25' to each side of the equation. -4.25 + 4.25 + y = -4.308421985 + 4.25 Combine like terms: -4.25 + 4.25 = 0.00 0.00 + y = -4.308421985 + 4.25 y = -4.308421985 + 4.25 Combine like terms: -4.308421985 + 4.25 = -0.058421985 y = -0.058421985 Simplifying y = -0.058421985

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.558421985, -0.058421985}

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