-3y^2+12y=3.4225

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Solution for -3y^2+12y=3.4225 equation:


Simplifying
-3y2 + 12y = 3.4225

Reorder the terms:
12y + -3y2 = 3.4225

Solving
12y + -3y2 = 3.4225

Solving for variable 'y'.

Reorder the terms:
-3.4225 + 12y + -3y2 = 3.4225 + -3.4225

Combine like terms: 3.4225 + -3.4225 = 0.0000
-3.4225 + 12y + -3y2 = 0.0000

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
1.140833333 + -4y + y2 = 0.0000

Move the constant term to the right:

Add '-1.140833333' to each side of the equation.
1.140833333 + -4y + -1.140833333 + y2 = 0.0000 + -1.140833333

Reorder the terms:
1.140833333 + -1.140833333 + -4y + y2 = 0.0000 + -1.140833333

Combine like terms: 1.140833333 + -1.140833333 = 0.000000000
0.000000000 + -4y + y2 = 0.0000 + -1.140833333
-4y + y2 = 0.0000 + -1.140833333

Combine like terms: 0.0000 + -1.140833333 = -1.140833333
-4y + y2 = -1.140833333

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = -1.140833333 + 4

Reorder the terms:
4 + -4y + y2 = -1.140833333 + 4

Combine like terms: -1.140833333 + 4 = 2.859166667
4 + -4y + y2 = 2.859166667

Factor a perfect square on the left side:
(y + -2)(y + -2) = 2.859166667

Calculate the square root of the right side: 1.690907055

Break this problem into two subproblems by setting 
(y + -2) equal to 1.690907055 and -1.690907055.

Subproblem 1

y + -2 = 1.690907055 Simplifying y + -2 = 1.690907055 Reorder the terms: -2 + y = 1.690907055 Solving -2 + y = 1.690907055 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 1.690907055 + 2 Combine like terms: -2 + 2 = 0 0 + y = 1.690907055 + 2 y = 1.690907055 + 2 Combine like terms: 1.690907055 + 2 = 3.690907055 y = 3.690907055 Simplifying y = 3.690907055

Subproblem 2

y + -2 = -1.690907055 Simplifying y + -2 = -1.690907055 Reorder the terms: -2 + y = -1.690907055 Solving -2 + y = -1.690907055 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -1.690907055 + 2 Combine like terms: -2 + 2 = 0 0 + y = -1.690907055 + 2 y = -1.690907055 + 2 Combine like terms: -1.690907055 + 2 = 0.309092945 y = 0.309092945 Simplifying y = 0.309092945

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.690907055, 0.309092945}

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