3y^2-12y+7=0

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Solution for 3y^2-12y+7=0 equation:


Simplifying
3y2 + -12y + 7 = 0

Reorder the terms:
7 + -12y + 3y2 = 0

Solving
7 + -12y + 3y2 = 0

Solving for variable 'y'.

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

Divide each side by '3'.
2.333333333 + -4y + y2 = 0

Move the constant term to the right:

Add '-2.333333333' to each side of the equation.
2.333333333 + -4y + -2.333333333 + y2 = 0 + -2.333333333

Reorder the terms:
2.333333333 + -2.333333333 + -4y + y2 = 0 + -2.333333333

Combine like terms: 2.333333333 + -2.333333333 = 0.000000000
0.000000000 + -4y + y2 = 0 + -2.333333333
-4y + y2 = 0 + -2.333333333

Combine like terms: 0 + -2.333333333 = -2.333333333
-4y + y2 = -2.333333333

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 = -2.333333333 + 4

Reorder the terms:
4 + -4y + y2 = -2.333333333 + 4

Combine like terms: -2.333333333 + 4 = 1.666666667
4 + -4y + y2 = 1.666666667

Factor a perfect square on the left side:
(y + -2)(y + -2) = 1.666666667

Calculate the square root of the right side: 1.290994449

Break this problem into two subproblems by setting 
(y + -2) equal to 1.290994449 and -1.290994449.

Subproblem 1

y + -2 = 1.290994449 Simplifying y + -2 = 1.290994449 Reorder the terms: -2 + y = 1.290994449 Solving -2 + y = 1.290994449 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 = 1.290994449 + 2 Combine like terms: -2 + 2 = 0 0 + y = 1.290994449 + 2 y = 1.290994449 + 2 Combine like terms: 1.290994449 + 2 = 3.290994449 y = 3.290994449 Simplifying y = 3.290994449

Subproblem 2

y + -2 = -1.290994449 Simplifying y + -2 = -1.290994449 Reorder the terms: -2 + y = -1.290994449 Solving -2 + y = -1.290994449 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 = -1.290994449 + 2 Combine like terms: -2 + 2 = 0 0 + y = -1.290994449 + 2 y = -1.290994449 + 2 Combine like terms: -1.290994449 + 2 = 0.709005551 y = 0.709005551 Simplifying y = 0.709005551

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.290994449, 0.709005551}

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