2y^2-16y-39=0

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Solution for 2y^2-16y-39=0 equation:


Simplifying
2y2 + -16y + -39 = 0

Reorder the terms:
-39 + -16y + 2y2 = 0

Solving
-39 + -16y + 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'.
-19.5 + -8y + y2 = 0

Move the constant term to the right:

Add '19.5' to each side of the equation.
-19.5 + -8y + 19.5 + y2 = 0 + 19.5

Reorder the terms:
-19.5 + 19.5 + -8y + y2 = 0 + 19.5

Combine like terms: -19.5 + 19.5 = 0.0
0.0 + -8y + y2 = 0 + 19.5
-8y + y2 = 0 + 19.5

Combine like terms: 0 + 19.5 = 19.5
-8y + y2 = 19.5

The y term is -8y.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8y + 16 + y2 = 19.5 + 16

Reorder the terms:
16 + -8y + y2 = 19.5 + 16

Combine like terms: 19.5 + 16 = 35.5
16 + -8y + y2 = 35.5

Factor a perfect square on the left side:
(y + -4)(y + -4) = 35.5

Calculate the square root of the right side: 5.958187644

Break this problem into two subproblems by setting 
(y + -4) equal to 5.958187644 and -5.958187644.

Subproblem 1

y + -4 = 5.958187644 Simplifying y + -4 = 5.958187644 Reorder the terms: -4 + y = 5.958187644 Solving -4 + y = 5.958187644 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + y = 5.958187644 + 4 Combine like terms: -4 + 4 = 0 0 + y = 5.958187644 + 4 y = 5.958187644 + 4 Combine like terms: 5.958187644 + 4 = 9.958187644 y = 9.958187644 Simplifying y = 9.958187644

Subproblem 2

y + -4 = -5.958187644 Simplifying y + -4 = -5.958187644 Reorder the terms: -4 + y = -5.958187644 Solving -4 + y = -5.958187644 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + y = -5.958187644 + 4 Combine like terms: -4 + 4 = 0 0 + y = -5.958187644 + 4 y = -5.958187644 + 4 Combine like terms: -5.958187644 + 4 = -1.958187644 y = -1.958187644 Simplifying y = -1.958187644

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.958187644, -1.958187644}

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