(3y*y-7y+4)=1

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Solution for (3y*y-7y+4)=1 equation:


Simplifying
(3y * y + -7y + 4) = 1

Multiply y * y
(3y2 + -7y + 4) = 1

Reorder the terms:
(4 + -7y + 3y2) = 1

Remove parenthesis around (4 + -7y + 3y2)
4 + -7y + 3y2 = 1

Solving
4 + -7y + 3y2 = 1

Solving for variable 'y'.

Reorder the terms:
4 + -1 + -7y + 3y2 = 1 + -1

Combine like terms: 4 + -1 = 3
3 + -7y + 3y2 = 1 + -1

Combine like terms: 1 + -1 = 0
3 + -7y + 3y2 = 0

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

Divide each side by '3'.
1 + -2.333333333y + y2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -2.333333333y + -1 + y2 = 0 + -1

Reorder the terms:
1 + -1 + -2.333333333y + y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2.333333333y + y2 = 0 + -1
-2.333333333y + y2 = 0 + -1

Combine like terms: 0 + -1 = -1
-2.333333333y + y2 = -1

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 = -1 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333y + y2 = -1 + 1.361111112

Combine like terms: -1 + 1.361111112 = 0.361111112
1.361111112 + -2.333333333y + y2 = 0.361111112

Factor a perfect square on the left side:
(y + -1.166666667)(y + -1.166666667) = 0.361111112

Calculate the square root of the right side: 0.600925213

Break this problem into two subproblems by setting 
(y + -1.166666667) equal to 0.600925213 and -0.600925213.

Subproblem 1

y + -1.166666667 = 0.600925213 Simplifying y + -1.166666667 = 0.600925213 Reorder the terms: -1.166666667 + y = 0.600925213 Solving -1.166666667 + y = 0.600925213 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 = 0.600925213 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = 0.600925213 + 1.166666667 y = 0.600925213 + 1.166666667 Combine like terms: 0.600925213 + 1.166666667 = 1.76759188 y = 1.76759188 Simplifying y = 1.76759188

Subproblem 2

y + -1.166666667 = -0.600925213 Simplifying y + -1.166666667 = -0.600925213 Reorder the terms: -1.166666667 + y = -0.600925213 Solving -1.166666667 + y = -0.600925213 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 = -0.600925213 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + y = -0.600925213 + 1.166666667 y = -0.600925213 + 1.166666667 Combine like terms: -0.600925213 + 1.166666667 = 0.565741454 y = 0.565741454 Simplifying y = 0.565741454

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.76759188, 0.565741454}

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