5y^2-45y+9=0

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Solution for 5y^2-45y+9=0 equation:


Simplifying
5y2 + -45y + 9 = 0

Reorder the terms:
9 + -45y + 5y2 = 0

Solving
9 + -45y + 5y2 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
1.8 + -9y + y2 = 0

Move the constant term to the right:

Add '-1.8' to each side of the equation.
1.8 + -9y + -1.8 + y2 = 0 + -1.8

Reorder the terms:
1.8 + -1.8 + -9y + y2 = 0 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + -9y + y2 = 0 + -1.8
-9y + y2 = 0 + -1.8

Combine like terms: 0 + -1.8 = -1.8
-9y + y2 = -1.8

The y term is -9y.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9y + 20.25 + y2 = -1.8 + 20.25

Reorder the terms:
20.25 + -9y + y2 = -1.8 + 20.25

Combine like terms: -1.8 + 20.25 = 18.45
20.25 + -9y + y2 = 18.45

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 18.45

Calculate the square root of the right side: 4.295346319

Break this problem into two subproblems by setting 
(y + -4.5) equal to 4.295346319 and -4.295346319.

Subproblem 1

y + -4.5 = 4.295346319 Simplifying y + -4.5 = 4.295346319 Reorder the terms: -4.5 + y = 4.295346319 Solving -4.5 + y = 4.295346319 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = 4.295346319 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 4.295346319 + 4.5 y = 4.295346319 + 4.5 Combine like terms: 4.295346319 + 4.5 = 8.795346319 y = 8.795346319 Simplifying y = 8.795346319

Subproblem 2

y + -4.5 = -4.295346319 Simplifying y + -4.5 = -4.295346319 Reorder the terms: -4.5 + y = -4.295346319 Solving -4.5 + y = -4.295346319 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = -4.295346319 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -4.295346319 + 4.5 y = -4.295346319 + 4.5 Combine like terms: -4.295346319 + 4.5 = 0.204653681 y = 0.204653681 Simplifying y = 0.204653681

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.795346319, 0.204653681}

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