2y^2-12y+7=0

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


Simplifying
2y2 + -12y + 7 = 0

Reorder the terms:
7 + -12y + 2y2 = 0

Solving
7 + -12y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
3.5 + -6y + y2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + -6y + -3.5 + y2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + -6y + y2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + -6y + y2 = 0 + -3.5
-6y + y2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
-6y + y2 = -3.5

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = -3.5 + 9

Reorder the terms:
9 + -6y + y2 = -3.5 + 9

Combine like terms: -3.5 + 9 = 5.5
9 + -6y + y2 = 5.5

Factor a perfect square on the left side:
(y + -3)(y + -3) = 5.5

Calculate the square root of the right side: 2.34520788

Break this problem into two subproblems by setting 
(y + -3) equal to 2.34520788 and -2.34520788.

Subproblem 1

y + -3 = 2.34520788 Simplifying y + -3 = 2.34520788 Reorder the terms: -3 + y = 2.34520788 Solving -3 + y = 2.34520788 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 2.34520788 + 3 Combine like terms: -3 + 3 = 0 0 + y = 2.34520788 + 3 y = 2.34520788 + 3 Combine like terms: 2.34520788 + 3 = 5.34520788 y = 5.34520788 Simplifying y = 5.34520788

Subproblem 2

y + -3 = -2.34520788 Simplifying y + -3 = -2.34520788 Reorder the terms: -3 + y = -2.34520788 Solving -3 + y = -2.34520788 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -2.34520788 + 3 Combine like terms: -3 + 3 = 0 0 + y = -2.34520788 + 3 y = -2.34520788 + 3 Combine like terms: -2.34520788 + 3 = 0.65479212 y = 0.65479212 Simplifying y = 0.65479212

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.34520788, 0.65479212}

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