0=y^2-12y-80

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Solution for 0=y^2-12y-80 equation:


Simplifying
0 = y2 + -12y + -80

Reorder the terms:
0 = -80 + -12y + y2

Solving
0 = -80 + -12y + y2

Solving for variable 'y'.

Combine like terms: 0 + 80 = 80
80 + 12y + -1y2 = -80 + -12y + y2 + 80 + 12y + -1y2

Reorder the terms:
80 + 12y + -1y2 = -80 + 80 + -12y + 12y + y2 + -1y2

Combine like terms: -80 + 80 = 0
80 + 12y + -1y2 = 0 + -12y + 12y + y2 + -1y2
80 + 12y + -1y2 = -12y + 12y + y2 + -1y2

Combine like terms: -12y + 12y = 0
80 + 12y + -1y2 = 0 + y2 + -1y2
80 + 12y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
80 + 12y + -1y2 = 0

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

Divide each side by '-1'.
-80 + -12y + y2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + -12y + 80 + y2 = 0 + 80

Reorder the terms:
-80 + 80 + -12y + y2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + -12y + y2 = 0 + 80
-12y + y2 = 0 + 80

Combine like terms: 0 + 80 = 80
-12y + y2 = 80

The y term is -12y.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12y + 36 + y2 = 80 + 36

Reorder the terms:
36 + -12y + y2 = 80 + 36

Combine like terms: 80 + 36 = 116
36 + -12y + y2 = 116

Factor a perfect square on the left side:
(y + -6)(y + -6) = 116

Calculate the square root of the right side: 10.770329614

Break this problem into two subproblems by setting 
(y + -6) equal to 10.770329614 and -10.770329614.

Subproblem 1

y + -6 = 10.770329614 Simplifying y + -6 = 10.770329614 Reorder the terms: -6 + y = 10.770329614 Solving -6 + y = 10.770329614 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = 10.770329614 + 6 Combine like terms: -6 + 6 = 0 0 + y = 10.770329614 + 6 y = 10.770329614 + 6 Combine like terms: 10.770329614 + 6 = 16.770329614 y = 16.770329614 Simplifying y = 16.770329614

Subproblem 2

y + -6 = -10.770329614 Simplifying y + -6 = -10.770329614 Reorder the terms: -6 + y = -10.770329614 Solving -6 + y = -10.770329614 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = -10.770329614 + 6 Combine like terms: -6 + 6 = 0 0 + y = -10.770329614 + 6 y = -10.770329614 + 6 Combine like terms: -10.770329614 + 6 = -4.770329614 y = -4.770329614 Simplifying y = -4.770329614

Solution

The solution to the problem is based on the solutions from the subproblems. y = {16.770329614, -4.770329614}

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