9y^2-58y+21=0

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Solution for 9y^2-58y+21=0 equation:


Simplifying
9y2 + -58y + 21 = 0

Reorder the terms:
21 + -58y + 9y2 = 0

Solving
21 + -58y + 9y2 = 0

Solving for variable 'y'.

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

Divide each side by '9'.
2.333333333 + -6.444444444y + y2 = 0

Move the constant term to the right:

Add '-2.333333333' to each side of the equation.
2.333333333 + -6.444444444y + -2.333333333 + y2 = 0 + -2.333333333

Reorder the terms:
2.333333333 + -2.333333333 + -6.444444444y + y2 = 0 + -2.333333333

Combine like terms: 2.333333333 + -2.333333333 = 0.000000000
0.000000000 + -6.444444444y + y2 = 0 + -2.333333333
-6.444444444y + y2 = 0 + -2.333333333

Combine like terms: 0 + -2.333333333 = -2.333333333
-6.444444444y + y2 = -2.333333333

The y term is -6.444444444y.  Take half its coefficient (-3.222222222).
Square it (10.38271605) and add it to both sides.

Add '10.38271605' to each side of the equation.
-6.444444444y + 10.38271605 + y2 = -2.333333333 + 10.38271605

Reorder the terms:
10.38271605 + -6.444444444y + y2 = -2.333333333 + 10.38271605

Combine like terms: -2.333333333 + 10.38271605 = 8.049382717
10.38271605 + -6.444444444y + y2 = 8.049382717

Factor a perfect square on the left side:
(y + -3.222222222)(y + -3.222222222) = 8.049382717

Calculate the square root of the right side: 2.837143408

Break this problem into two subproblems by setting 
(y + -3.222222222) equal to 2.837143408 and -2.837143408.

Subproblem 1

y + -3.222222222 = 2.837143408 Simplifying y + -3.222222222 = 2.837143408 Reorder the terms: -3.222222222 + y = 2.837143408 Solving -3.222222222 + y = 2.837143408 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.222222222' to each side of the equation. -3.222222222 + 3.222222222 + y = 2.837143408 + 3.222222222 Combine like terms: -3.222222222 + 3.222222222 = 0.000000000 0.000000000 + y = 2.837143408 + 3.222222222 y = 2.837143408 + 3.222222222 Combine like terms: 2.837143408 + 3.222222222 = 6.05936563 y = 6.05936563 Simplifying y = 6.05936563

Subproblem 2

y + -3.222222222 = -2.837143408 Simplifying y + -3.222222222 = -2.837143408 Reorder the terms: -3.222222222 + y = -2.837143408 Solving -3.222222222 + y = -2.837143408 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.222222222' to each side of the equation. -3.222222222 + 3.222222222 + y = -2.837143408 + 3.222222222 Combine like terms: -3.222222222 + 3.222222222 = 0.000000000 0.000000000 + y = -2.837143408 + 3.222222222 y = -2.837143408 + 3.222222222 Combine like terms: -2.837143408 + 3.222222222 = 0.385078814 y = 0.385078814 Simplifying y = 0.385078814

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.05936563, 0.385078814}

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