12y-y^2=30

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Solution for 12y-y^2=30 equation:


Simplifying
12y + -1y2 = 30

Solving
12y + -1y2 = 30

Solving for variable 'y'.

Reorder the terms:
-30 + 12y + -1y2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 12y + -1y2 = 0

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

Divide each side by '-1'.
30 + -12y + y2 = 0

Move the constant term to the right:

Add '-30' to each side of the equation.
30 + -12y + -30 + y2 = 0 + -30

Reorder the terms:
30 + -30 + -12y + y2 = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -12y + y2 = 0 + -30
-12y + y2 = 0 + -30

Combine like terms: 0 + -30 = -30
-12y + y2 = -30

The y term is -12y.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12y + 36 + y2 = -30 + 36

Reorder the terms:
36 + -12y + y2 = -30 + 36

Combine like terms: -30 + 36 = 6
36 + -12y + y2 = 6

Factor a perfect square on the left side:
(y + -6)(y + -6) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(y + -6) equal to 2.449489743 and -2.449489743.

Subproblem 1

y + -6 = 2.449489743 Simplifying y + -6 = 2.449489743 Reorder the terms: -6 + y = 2.449489743 Solving -6 + y = 2.449489743 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = 2.449489743 + 6 Combine like terms: -6 + 6 = 0 0 + y = 2.449489743 + 6 y = 2.449489743 + 6 Combine like terms: 2.449489743 + 6 = 8.449489743 y = 8.449489743 Simplifying y = 8.449489743

Subproblem 2

y + -6 = -2.449489743 Simplifying y + -6 = -2.449489743 Reorder the terms: -6 + y = -2.449489743 Solving -6 + y = -2.449489743 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = -2.449489743 + 6 Combine like terms: -6 + 6 = 0 0 + y = -2.449489743 + 6 y = -2.449489743 + 6 Combine like terms: -2.449489743 + 6 = 3.550510257 y = 3.550510257 Simplifying y = 3.550510257

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.449489743, 3.550510257}

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