y^2-6y-39=0

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Solution for y^2-6y-39=0 equation:


Simplifying
y2 + -6y + -39 = 0

Reorder the terms:
-39 + -6y + y2 = 0

Solving
-39 + -6y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + -6y + 39 + y2 = 0 + 39

Reorder the terms:
-39 + 39 + -6y + y2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + -6y + y2 = 0 + 39
-6y + y2 = 0 + 39

Combine like terms: 0 + 39 = 39
-6y + y2 = 39

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = 39 + 9

Reorder the terms:
9 + -6y + y2 = 39 + 9

Combine like terms: 39 + 9 = 48
9 + -6y + y2 = 48

Factor a perfect square on the left side:
(y + -3)(y + -3) = 48

Calculate the square root of the right side: 6.92820323

Break this problem into two subproblems by setting 
(y + -3) equal to 6.92820323 and -6.92820323.

Subproblem 1

y + -3 = 6.92820323 Simplifying y + -3 = 6.92820323 Reorder the terms: -3 + y = 6.92820323 Solving -3 + y = 6.92820323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 6.92820323 + 3 Combine like terms: -3 + 3 = 0 0 + y = 6.92820323 + 3 y = 6.92820323 + 3 Combine like terms: 6.92820323 + 3 = 9.92820323 y = 9.92820323 Simplifying y = 9.92820323

Subproblem 2

y + -3 = -6.92820323 Simplifying y + -3 = -6.92820323 Reorder the terms: -3 + y = -6.92820323 Solving -3 + y = -6.92820323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -6.92820323 + 3 Combine like terms: -3 + 3 = 0 0 + y = -6.92820323 + 3 y = -6.92820323 + 3 Combine like terms: -6.92820323 + 3 = -3.92820323 y = -3.92820323 Simplifying y = -3.92820323

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.92820323, -3.92820323}

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