12=y^2-8y-16

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Solution for 12=y^2-8y-16 equation:


Simplifying
12 = y2 + -8y + -16

Reorder the terms:
12 = -16 + -8y + y2

Solving
12 = -16 + -8y + y2

Solving for variable 'y'.

Combine like terms: 12 + 16 = 28
28 + 8y + -1y2 = -16 + -8y + y2 + 16 + 8y + -1y2

Reorder the terms:
28 + 8y + -1y2 = -16 + 16 + -8y + 8y + y2 + -1y2

Combine like terms: -16 + 16 = 0
28 + 8y + -1y2 = 0 + -8y + 8y + y2 + -1y2
28 + 8y + -1y2 = -8y + 8y + y2 + -1y2

Combine like terms: -8y + 8y = 0
28 + 8y + -1y2 = 0 + y2 + -1y2
28 + 8y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
28 + 8y + -1y2 = 0

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

Divide each side by '-1'.
-28 + -8y + y2 = 0

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -8y + 28 + y2 = 0 + 28

Reorder the terms:
-28 + 28 + -8y + y2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -8y + y2 = 0 + 28
-8y + y2 = 0 + 28

Combine like terms: 0 + 28 = 28
-8y + y2 = 28

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 = 28 + 16

Reorder the terms:
16 + -8y + y2 = 28 + 16

Combine like terms: 28 + 16 = 44
16 + -8y + y2 = 44

Factor a perfect square on the left side:
(y + -4)(y + -4) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(y + -4) equal to 6.633249581 and -6.633249581.

Subproblem 1

y + -4 = 6.633249581 Simplifying y + -4 = 6.633249581 Reorder the terms: -4 + y = 6.633249581 Solving -4 + y = 6.633249581 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 = 6.633249581 + 4 Combine like terms: -4 + 4 = 0 0 + y = 6.633249581 + 4 y = 6.633249581 + 4 Combine like terms: 6.633249581 + 4 = 10.633249581 y = 10.633249581 Simplifying y = 10.633249581

Subproblem 2

y + -4 = -6.633249581 Simplifying y + -4 = -6.633249581 Reorder the terms: -4 + y = -6.633249581 Solving -4 + y = -6.633249581 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 = -6.633249581 + 4 Combine like terms: -4 + 4 = 0 0 + y = -6.633249581 + 4 y = -6.633249581 + 4 Combine like terms: -6.633249581 + 4 = -2.633249581 y = -2.633249581 Simplifying y = -2.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.633249581, -2.633249581}

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