12y^2-28y+4=1

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Solution for 12y^2-28y+4=1 equation:


Simplifying
12y2 + -28y + 4 = 1

Reorder the terms:
4 + -28y + 12y2 = 1

Solving
4 + -28y + 12y2 = 1

Solving for variable 'y'.

Reorder the terms:
4 + -1 + -28y + 12y2 = 1 + -1

Combine like terms: 4 + -1 = 3
3 + -28y + 12y2 = 1 + -1

Combine like terms: 1 + -1 = 0
3 + -28y + 12y2 = 0

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

Divide each side by '12'.
0.25 + -2.333333333y + y2 = 0

Move the constant term to the right:

Add '-0.25' to each side of the equation.
0.25 + -2.333333333y + -0.25 + y2 = 0 + -0.25

Reorder the terms:
0.25 + -0.25 + -2.333333333y + y2 = 0 + -0.25

Combine like terms: 0.25 + -0.25 = 0.00
0.00 + -2.333333333y + y2 = 0 + -0.25
-2.333333333y + y2 = 0 + -0.25

Combine like terms: 0 + -0.25 = -0.25
-2.333333333y + y2 = -0.25

The y term is -2.333333333y.  Take half its coefficient (-1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
-2.333333333y + 1.361111112 + y2 = -0.25 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333y + y2 = -0.25 + 1.361111112

Combine like terms: -0.25 + 1.361111112 = 1.111111112
1.361111112 + -2.333333333y + y2 = 1.111111112

Factor a perfect square on the left side:
(y + -1.166666667)(y + -1.166666667) = 1.111111112

Calculate the square root of the right side: 1.054092554

Break this problem into two subproblems by setting 
(y + -1.166666667) equal to 1.054092554 and -1.054092554.

Subproblem 1

y + -1.166666667 = 1.054092554 Simplifying y + -1.166666667 = 1.054092554 Reorder the terms: -1.166666667 + y = 1.054092554 Solving -1.166666667 + y = 1.054092554 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + y = 1.054092554 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = 1.054092554 + 1.166666667 y = 1.054092554 + 1.166666667 Combine like terms: 1.054092554 + 1.166666667 = 2.220759221 y = 2.220759221 Simplifying y = 2.220759221

Subproblem 2

y + -1.166666667 = -1.054092554 Simplifying y + -1.166666667 = -1.054092554 Reorder the terms: -1.166666667 + y = -1.054092554 Solving -1.166666667 + y = -1.054092554 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + y = -1.054092554 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = -1.054092554 + 1.166666667 y = -1.054092554 + 1.166666667 Combine like terms: -1.054092554 + 1.166666667 = 0.112574113 y = 0.112574113 Simplifying y = 0.112574113

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.220759221, 0.112574113}

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