y^2-8y-117=0

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Solution for y^2-8y-117=0 equation:


Simplifying
y2 + -8y + -117 = 0

Reorder the terms:
-117 + -8y + y2 = 0

Solving
-117 + -8y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '117' to each side of the equation.
-117 + -8y + 117 + y2 = 0 + 117

Reorder the terms:
-117 + 117 + -8y + y2 = 0 + 117

Combine like terms: -117 + 117 = 0
0 + -8y + y2 = 0 + 117
-8y + y2 = 0 + 117

Combine like terms: 0 + 117 = 117
-8y + y2 = 117

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 = 117 + 16

Reorder the terms:
16 + -8y + y2 = 117 + 16

Combine like terms: 117 + 16 = 133
16 + -8y + y2 = 133

Factor a perfect square on the left side:
(y + -4)(y + -4) = 133

Calculate the square root of the right side: 11.532562595

Break this problem into two subproblems by setting 
(y + -4) equal to 11.532562595 and -11.532562595.

Subproblem 1

y + -4 = 11.532562595 Simplifying y + -4 = 11.532562595 Reorder the terms: -4 + y = 11.532562595 Solving -4 + y = 11.532562595 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 = 11.532562595 + 4 Combine like terms: -4 + 4 = 0 0 + y = 11.532562595 + 4 y = 11.532562595 + 4 Combine like terms: 11.532562595 + 4 = 15.532562595 y = 15.532562595 Simplifying y = 15.532562595

Subproblem 2

y + -4 = -11.532562595 Simplifying y + -4 = -11.532562595 Reorder the terms: -4 + y = -11.532562595 Solving -4 + y = -11.532562595 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 = -11.532562595 + 4 Combine like terms: -4 + 4 = 0 0 + y = -11.532562595 + 4 y = -11.532562595 + 4 Combine like terms: -11.532562595 + 4 = -7.532562595 y = -7.532562595 Simplifying y = -7.532562595

Solution

The solution to the problem is based on the solutions from the subproblems. y = {15.532562595, -7.532562595}

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