5=(y^2)-(8*y)

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Solution for 5=(y^2)-(8*y) equation:


Simplifying
5 = (y2) + -1(8y)
5 = y2 + -1(8y)

Remove parenthesis around (8y)
5 = y2 + -1 * 8y

Multiply -1 * 8
5 = y2 + -8y

Reorder the terms:
5 = -8y + y2

Solving
5 = -8y + y2

Solving for variable 'y'.

Reorder the terms:
5 + 8y + -1y2 = -8y + 8y + y2 + -1y2

Combine like terms: -8y + 8y = 0
5 + 8y + -1y2 = 0 + y2 + -1y2
5 + 8y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
5 + 8y + -1y2 = 0

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

Divide each side by '-1'.
-5 + -8y + y2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -8y + 5 + y2 = 0 + 5

Reorder the terms:
-5 + 5 + -8y + y2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -8y + y2 = 0 + 5
-8y + y2 = 0 + 5

Combine like terms: 0 + 5 = 5
-8y + y2 = 5

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 = 5 + 16

Reorder the terms:
16 + -8y + y2 = 5 + 16

Combine like terms: 5 + 16 = 21
16 + -8y + y2 = 21

Factor a perfect square on the left side:
(y + -4)(y + -4) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(y + -4) equal to 4.582575695 and -4.582575695.

Subproblem 1

y + -4 = 4.582575695 Simplifying y + -4 = 4.582575695 Reorder the terms: -4 + y = 4.582575695 Solving -4 + y = 4.582575695 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 = 4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + y = 4.582575695 + 4 y = 4.582575695 + 4 Combine like terms: 4.582575695 + 4 = 8.582575695 y = 8.582575695 Simplifying y = 8.582575695

Subproblem 2

y + -4 = -4.582575695 Simplifying y + -4 = -4.582575695 Reorder the terms: -4 + y = -4.582575695 Solving -4 + y = -4.582575695 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 = -4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + y = -4.582575695 + 4 y = -4.582575695 + 4 Combine like terms: -4.582575695 + 4 = -0.582575695 y = -0.582575695 Simplifying y = -0.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.582575695, -0.582575695}

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