y=y^2-16y+4

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Solution for y=y^2-16y+4 equation:


Simplifying
y = y2 + -16y + 4

Reorder the terms:
y = 4 + -16y + y2

Solving
y = 4 + -16y + y2

Solving for variable 'y'.

Reorder the terms:
-4 + y + 16y + -1y2 = 4 + -16y + y2 + -4 + 16y + -1y2

Combine like terms: y + 16y = 17y
-4 + 17y + -1y2 = 4 + -16y + y2 + -4 + 16y + -1y2

Reorder the terms:
-4 + 17y + -1y2 = 4 + -4 + -16y + 16y + y2 + -1y2

Combine like terms: 4 + -4 = 0
-4 + 17y + -1y2 = 0 + -16y + 16y + y2 + -1y2
-4 + 17y + -1y2 = -16y + 16y + y2 + -1y2

Combine like terms: -16y + 16y = 0
-4 + 17y + -1y2 = 0 + y2 + -1y2
-4 + 17y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-4 + 17y + -1y2 = 0

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

Divide each side by '-1'.
4 + -17y + y2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -17y + -4 + y2 = 0 + -4

Reorder the terms:
4 + -4 + -17y + y2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -17y + y2 = 0 + -4
-17y + y2 = 0 + -4

Combine like terms: 0 + -4 = -4
-17y + y2 = -4

The y term is -17y.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17y + 72.25 + y2 = -4 + 72.25

Reorder the terms:
72.25 + -17y + y2 = -4 + 72.25

Combine like terms: -4 + 72.25 = 68.25
72.25 + -17y + y2 = 68.25

Factor a perfect square on the left side:
(y + -8.5)(y + -8.5) = 68.25

Calculate the square root of the right side: 8.261355821

Break this problem into two subproblems by setting 
(y + -8.5) equal to 8.261355821 and -8.261355821.

Subproblem 1

y + -8.5 = 8.261355821 Simplifying y + -8.5 = 8.261355821 Reorder the terms: -8.5 + y = 8.261355821 Solving -8.5 + y = 8.261355821 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + y = 8.261355821 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + y = 8.261355821 + 8.5 y = 8.261355821 + 8.5 Combine like terms: 8.261355821 + 8.5 = 16.761355821 y = 16.761355821 Simplifying y = 16.761355821

Subproblem 2

y + -8.5 = -8.261355821 Simplifying y + -8.5 = -8.261355821 Reorder the terms: -8.5 + y = -8.261355821 Solving -8.5 + y = -8.261355821 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + y = -8.261355821 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + y = -8.261355821 + 8.5 y = -8.261355821 + 8.5 Combine like terms: -8.261355821 + 8.5 = 0.238644179 y = 0.238644179 Simplifying y = 0.238644179

Solution

The solution to the problem is based on the solutions from the subproblems. y = {16.761355821, 0.238644179}

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