-3y^2+12y=3.43

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Solution for -3y^2+12y=3.43 equation:


Simplifying
-3y2 + 12y = 3.43

Reorder the terms:
12y + -3y2 = 3.43

Solving
12y + -3y2 = 3.43

Solving for variable 'y'.

Reorder the terms:
-3.43 + 12y + -3y2 = 3.43 + -3.43

Combine like terms: 3.43 + -3.43 = 0.00
-3.43 + 12y + -3y2 = 0.00

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

Divide each side by '-3'.
1.143333333 + -4y + y2 = 0.00

Move the constant term to the right:

Add '-1.143333333' to each side of the equation.
1.143333333 + -4y + -1.143333333 + y2 = 0.00 + -1.143333333

Reorder the terms:
1.143333333 + -1.143333333 + -4y + y2 = 0.00 + -1.143333333

Combine like terms: 1.143333333 + -1.143333333 = 0.000000000
0.000000000 + -4y + y2 = 0.00 + -1.143333333
-4y + y2 = 0.00 + -1.143333333

Combine like terms: 0.00 + -1.143333333 = -1.143333333
-4y + y2 = -1.143333333

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 = -1.143333333 + 4

Reorder the terms:
4 + -4y + y2 = -1.143333333 + 4

Combine like terms: -1.143333333 + 4 = 2.856666667
4 + -4y + y2 = 2.856666667

Factor a perfect square on the left side:
(y + -2)(y + -2) = 2.856666667

Calculate the square root of the right side: 1.690167645

Break this problem into two subproblems by setting 
(y + -2) equal to 1.690167645 and -1.690167645.

Subproblem 1

y + -2 = 1.690167645 Simplifying y + -2 = 1.690167645 Reorder the terms: -2 + y = 1.690167645 Solving -2 + y = 1.690167645 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 = 1.690167645 + 2 Combine like terms: -2 + 2 = 0 0 + y = 1.690167645 + 2 y = 1.690167645 + 2 Combine like terms: 1.690167645 + 2 = 3.690167645 y = 3.690167645 Simplifying y = 3.690167645

Subproblem 2

y + -2 = -1.690167645 Simplifying y + -2 = -1.690167645 Reorder the terms: -2 + y = -1.690167645 Solving -2 + y = -1.690167645 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 = -1.690167645 + 2 Combine like terms: -2 + 2 = 0 0 + y = -1.690167645 + 2 y = -1.690167645 + 2 Combine like terms: -1.690167645 + 2 = 0.309832355 y = 0.309832355 Simplifying y = 0.309832355

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.690167645, 0.309832355}

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