y^2-14y-39=0

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Solution for y^2-14y-39=0 equation:


Simplifying
y2 + -14y + -39 = 0

Reorder the terms:
-39 + -14y + y2 = 0

Solving
-39 + -14y + 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 + -14y + 39 + y2 = 0 + 39

Reorder the terms:
-39 + 39 + -14y + y2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + -14y + y2 = 0 + 39
-14y + y2 = 0 + 39

Combine like terms: 0 + 39 = 39
-14y + y2 = 39

The y term is -14y.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14y + 49 + y2 = 39 + 49

Reorder the terms:
49 + -14y + y2 = 39 + 49

Combine like terms: 39 + 49 = 88
49 + -14y + y2 = 88

Factor a perfect square on the left side:
(y + -7)(y + -7) = 88

Calculate the square root of the right side: 9.38083152

Break this problem into two subproblems by setting 
(y + -7) equal to 9.38083152 and -9.38083152.

Subproblem 1

y + -7 = 9.38083152 Simplifying y + -7 = 9.38083152 Reorder the terms: -7 + y = 9.38083152 Solving -7 + y = 9.38083152 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + y = 9.38083152 + 7 Combine like terms: -7 + 7 = 0 0 + y = 9.38083152 + 7 y = 9.38083152 + 7 Combine like terms: 9.38083152 + 7 = 16.38083152 y = 16.38083152 Simplifying y = 16.38083152

Subproblem 2

y + -7 = -9.38083152 Simplifying y + -7 = -9.38083152 Reorder the terms: -7 + y = -9.38083152 Solving -7 + y = -9.38083152 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + y = -9.38083152 + 7 Combine like terms: -7 + 7 = 0 0 + y = -9.38083152 + 7 y = -9.38083152 + 7 Combine like terms: -9.38083152 + 7 = -2.38083152 y = -2.38083152 Simplifying y = -2.38083152

Solution

The solution to the problem is based on the solutions from the subproblems. y = {16.38083152, -2.38083152}

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