9y^2-45y+38=0

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Solution for 9y^2-45y+38=0 equation:


Simplifying
9y2 + -45y + 38 = 0

Reorder the terms:
38 + -45y + 9y2 = 0

Solving
38 + -45y + 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'.
4.222222222 + -5y + y2 = 0

Move the constant term to the right:

Add '-4.222222222' to each side of the equation.
4.222222222 + -5y + -4.222222222 + y2 = 0 + -4.222222222

Reorder the terms:
4.222222222 + -4.222222222 + -5y + y2 = 0 + -4.222222222

Combine like terms: 4.222222222 + -4.222222222 = 0.000000000
0.000000000 + -5y + y2 = 0 + -4.222222222
-5y + y2 = 0 + -4.222222222

Combine like terms: 0 + -4.222222222 = -4.222222222
-5y + y2 = -4.222222222

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = -4.222222222 + 6.25

Reorder the terms:
6.25 + -5y + y2 = -4.222222222 + 6.25

Combine like terms: -4.222222222 + 6.25 = 2.027777778
6.25 + -5y + y2 = 2.027777778

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 2.027777778

Calculate the square root of the right side: 1.424000624

Break this problem into two subproblems by setting 
(y + -2.5) equal to 1.424000624 and -1.424000624.

Subproblem 1

y + -2.5 = 1.424000624 Simplifying y + -2.5 = 1.424000624 Reorder the terms: -2.5 + y = 1.424000624 Solving -2.5 + y = 1.424000624 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 1.424000624 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 1.424000624 + 2.5 y = 1.424000624 + 2.5 Combine like terms: 1.424000624 + 2.5 = 3.924000624 y = 3.924000624 Simplifying y = 3.924000624

Subproblem 2

y + -2.5 = -1.424000624 Simplifying y + -2.5 = -1.424000624 Reorder the terms: -2.5 + y = -1.424000624 Solving -2.5 + y = -1.424000624 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = -1.424000624 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -1.424000624 + 2.5 y = -1.424000624 + 2.5 Combine like terms: -1.424000624 + 2.5 = 1.075999376 y = 1.075999376 Simplifying y = 1.075999376

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.924000624, 1.075999376}

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