6y-y^2=4

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Solution for 6y-y^2=4 equation:


Simplifying
6y + -1y2 = 4

Solving
6y + -1y2 = 4

Solving for variable 'y'.

Reorder the terms:
-4 + 6y + -1y2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 6y + -1y2 = 0

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

Divide each side by '-1'.
4 + -6y + y2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -6y + -4 + y2 = 0 + -4

Reorder the terms:
4 + -4 + -6y + y2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -6y + y2 = 0 + -4
-6y + y2 = 0 + -4

Combine like terms: 0 + -4 = -4
-6y + y2 = -4

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = -4 + 9

Reorder the terms:
9 + -6y + y2 = -4 + 9

Combine like terms: -4 + 9 = 5
9 + -6y + y2 = 5

Factor a perfect square on the left side:
(y + -3)(y + -3) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(y + -3) equal to 2.236067978 and -2.236067978.

Subproblem 1

y + -3 = 2.236067978 Simplifying y + -3 = 2.236067978 Reorder the terms: -3 + y = 2.236067978 Solving -3 + y = 2.236067978 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 2.236067978 + 3 Combine like terms: -3 + 3 = 0 0 + y = 2.236067978 + 3 y = 2.236067978 + 3 Combine like terms: 2.236067978 + 3 = 5.236067978 y = 5.236067978 Simplifying y = 5.236067978

Subproblem 2

y + -3 = -2.236067978 Simplifying y + -3 = -2.236067978 Reorder the terms: -3 + y = -2.236067978 Solving -3 + y = -2.236067978 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -2.236067978 + 3 Combine like terms: -3 + 3 = 0 0 + y = -2.236067978 + 3 y = -2.236067978 + 3 Combine like terms: -2.236067978 + 3 = 0.763932022 y = 0.763932022 Simplifying y = 0.763932022

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.236067978, 0.763932022}

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