y^2-y-110=7

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Solution for y^2-y-110=7 equation:


Simplifying
y2 + -1y + -110 = 7

Reorder the terms:
-110 + -1y + y2 = 7

Solving
-110 + -1y + y2 = 7

Solving for variable 'y'.

Reorder the terms:
-110 + -7 + -1y + y2 = 7 + -7

Combine like terms: -110 + -7 = -117
-117 + -1y + y2 = 7 + -7

Combine like terms: 7 + -7 = 0
-117 + -1y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '117' to each side of the equation.
-117 + -1y + 117 + y2 = 0 + 117

Reorder the terms:
-117 + 117 + -1y + y2 = 0 + 117

Combine like terms: -117 + 117 = 0
0 + -1y + y2 = 0 + 117
-1y + y2 = 0 + 117

Combine like terms: 0 + 117 = 117
-1y + y2 = 117

The y term is -1y.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1y + 0.25 + y2 = 117 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 117 + 0.25

Combine like terms: 117 + 0.25 = 117.25
0.25 + -1y + y2 = 117.25

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 117.25

Calculate the square root of the right side: 10.828203914

Break this problem into two subproblems by setting 
(y + -0.5) equal to 10.828203914 and -10.828203914.

Subproblem 1

y + -0.5 = 10.828203914 Simplifying y + -0.5 = 10.828203914 Reorder the terms: -0.5 + y = 10.828203914 Solving -0.5 + y = 10.828203914 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = 10.828203914 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 10.828203914 + 0.5 y = 10.828203914 + 0.5 Combine like terms: 10.828203914 + 0.5 = 11.328203914 y = 11.328203914 Simplifying y = 11.328203914

Subproblem 2

y + -0.5 = -10.828203914 Simplifying y + -0.5 = -10.828203914 Reorder the terms: -0.5 + y = -10.828203914 Solving -0.5 + y = -10.828203914 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + y = -10.828203914 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -10.828203914 + 0.5 y = -10.828203914 + 0.5 Combine like terms: -10.828203914 + 0.5 = -10.328203914 y = -10.328203914 Simplifying y = -10.328203914

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.328203914, -10.328203914}

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