3y+6=y^2

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Solution for 3y+6=y^2 equation:


Simplifying
3y + 6 = y2

Reorder the terms:
6 + 3y = y2

Solving
6 + 3y = y2

Solving for variable 'y'.

Combine like terms: y2 + -1y2 = 0
6 + 3y + -1y2 = 0

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

Divide each side by '-1'.
-6 + -3y + y2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -3y + 6 + y2 = 0 + 6

Reorder the terms:
-6 + 6 + -3y + y2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -3y + y2 = 0 + 6
-3y + y2 = 0 + 6

Combine like terms: 0 + 6 = 6
-3y + y2 = 6

The y term is -3y.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y + 2.25 + y2 = 6 + 2.25

Reorder the terms:
2.25 + -3y + y2 = 6 + 2.25

Combine like terms: 6 + 2.25 = 8.25
2.25 + -3y + y2 = 8.25

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(y + -1.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

y + -1.5 = 2.872281323 Simplifying y + -1.5 = 2.872281323 Reorder the terms: -1.5 + y = 2.872281323 Solving -1.5 + y = 2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = 2.872281323 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = 2.872281323 + 1.5 y = 2.872281323 + 1.5 Combine like terms: 2.872281323 + 1.5 = 4.372281323 y = 4.372281323 Simplifying y = 4.372281323

Subproblem 2

y + -1.5 = -2.872281323 Simplifying y + -1.5 = -2.872281323 Reorder the terms: -1.5 + y = -2.872281323 Solving -1.5 + y = -2.872281323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = -2.872281323 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = -2.872281323 + 1.5 y = -2.872281323 + 1.5 Combine like terms: -2.872281323 + 1.5 = -1.372281323 y = -1.372281323 Simplifying y = -1.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.372281323, -1.372281323}

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