39y-17-2y^2=0

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Solution for 39y-17-2y^2=0 equation:


Simplifying
39y + -17 + -2y2 = 0

Reorder the terms:
-17 + 39y + -2y2 = 0

Solving
-17 + 39y + -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'.
8.5 + -19.5y + y2 = 0

Move the constant term to the right:

Add '-8.5' to each side of the equation.
8.5 + -19.5y + -8.5 + y2 = 0 + -8.5

Reorder the terms:
8.5 + -8.5 + -19.5y + y2 = 0 + -8.5

Combine like terms: 8.5 + -8.5 = 0.0
0.0 + -19.5y + y2 = 0 + -8.5
-19.5y + y2 = 0 + -8.5

Combine like terms: 0 + -8.5 = -8.5
-19.5y + y2 = -8.5

The y term is -19.5y.  Take half its coefficient (-9.75).
Square it (95.0625) and add it to both sides.

Add '95.0625' to each side of the equation.
-19.5y + 95.0625 + y2 = -8.5 + 95.0625

Reorder the terms:
95.0625 + -19.5y + y2 = -8.5 + 95.0625

Combine like terms: -8.5 + 95.0625 = 86.5625
95.0625 + -19.5y + y2 = 86.5625

Factor a perfect square on the left side:
(y + -9.75)(y + -9.75) = 86.5625

Calculate the square root of the right side: 9.303897033

Break this problem into two subproblems by setting 
(y + -9.75) equal to 9.303897033 and -9.303897033.

Subproblem 1

y + -9.75 = 9.303897033 Simplifying y + -9.75 = 9.303897033 Reorder the terms: -9.75 + y = 9.303897033 Solving -9.75 + y = 9.303897033 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9.75' to each side of the equation. -9.75 + 9.75 + y = 9.303897033 + 9.75 Combine like terms: -9.75 + 9.75 = 0.00 0.00 + y = 9.303897033 + 9.75 y = 9.303897033 + 9.75 Combine like terms: 9.303897033 + 9.75 = 19.053897033 y = 19.053897033 Simplifying y = 19.053897033

Subproblem 2

y + -9.75 = -9.303897033 Simplifying y + -9.75 = -9.303897033 Reorder the terms: -9.75 + y = -9.303897033 Solving -9.75 + y = -9.303897033 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9.75' to each side of the equation. -9.75 + 9.75 + y = -9.303897033 + 9.75 Combine like terms: -9.75 + 9.75 = 0.00 0.00 + y = -9.303897033 + 9.75 y = -9.303897033 + 9.75 Combine like terms: -9.303897033 + 9.75 = 0.446102967 y = 0.446102967 Simplifying y = 0.446102967

Solution

The solution to the problem is based on the solutions from the subproblems. y = {19.053897033, 0.446102967}

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