0=y^2-4y-92

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Solution for 0=y^2-4y-92 equation:


Simplifying
0 = y2 + -4y + -92

Reorder the terms:
0 = -92 + -4y + y2

Solving
0 = -92 + -4y + y2

Solving for variable 'y'.

Combine like terms: 0 + 92 = 92
92 + 4y + -1y2 = -92 + -4y + y2 + 92 + 4y + -1y2

Reorder the terms:
92 + 4y + -1y2 = -92 + 92 + -4y + 4y + y2 + -1y2

Combine like terms: -92 + 92 = 0
92 + 4y + -1y2 = 0 + -4y + 4y + y2 + -1y2
92 + 4y + -1y2 = -4y + 4y + y2 + -1y2

Combine like terms: -4y + 4y = 0
92 + 4y + -1y2 = 0 + y2 + -1y2
92 + 4y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
92 + 4y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-92 + -4y + y2 = 0

Move the constant term to the right:

Add '92' to each side of the equation.
-92 + -4y + 92 + y2 = 0 + 92

Reorder the terms:
-92 + 92 + -4y + y2 = 0 + 92

Combine like terms: -92 + 92 = 0
0 + -4y + y2 = 0 + 92
-4y + y2 = 0 + 92

Combine like terms: 0 + 92 = 92
-4y + y2 = 92

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = 92 + 4

Reorder the terms:
4 + -4y + y2 = 92 + 4

Combine like terms: 92 + 4 = 96
4 + -4y + y2 = 96

Factor a perfect square on the left side:
(y + -2)(y + -2) = 96

Calculate the square root of the right side: 9.797958971

Break this problem into two subproblems by setting 
(y + -2) equal to 9.797958971 and -9.797958971.

Subproblem 1

y + -2 = 9.797958971 Simplifying y + -2 = 9.797958971 Reorder the terms: -2 + y = 9.797958971 Solving -2 + y = 9.797958971 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 9.797958971 + 2 Combine like terms: -2 + 2 = 0 0 + y = 9.797958971 + 2 y = 9.797958971 + 2 Combine like terms: 9.797958971 + 2 = 11.797958971 y = 11.797958971 Simplifying y = 11.797958971

Subproblem 2

y + -2 = -9.797958971 Simplifying y + -2 = -9.797958971 Reorder the terms: -2 + y = -9.797958971 Solving -2 + y = -9.797958971 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -9.797958971 + 2 Combine like terms: -2 + 2 = 0 0 + y = -9.797958971 + 2 y = -9.797958971 + 2 Combine like terms: -9.797958971 + 2 = -7.797958971 y = -7.797958971 Simplifying y = -7.797958971

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.797958971, -7.797958971}

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