y^2-9y+11=0

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Solution for y^2-9y+11=0 equation:


Simplifying
y2 + -9y + 11 = 0

Reorder the terms:
11 + -9y + y2 = 0

Solving
11 + -9y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + -9y + -11 + y2 = 0 + -11

Reorder the terms:
11 + -11 + -9y + y2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + -9y + y2 = 0 + -11
-9y + y2 = 0 + -11

Combine like terms: 0 + -11 = -11
-9y + y2 = -11

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 = -11 + 20.25

Reorder the terms:
20.25 + -9y + y2 = -11 + 20.25

Combine like terms: -11 + 20.25 = 9.25
20.25 + -9y + y2 = 9.25

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(y + -4.5) equal to 3.041381265 and -3.041381265.

Subproblem 1

y + -4.5 = 3.041381265 Simplifying y + -4.5 = 3.041381265 Reorder the terms: -4.5 + y = 3.041381265 Solving -4.5 + y = 3.041381265 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 = 3.041381265 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 3.041381265 + 4.5 y = 3.041381265 + 4.5 Combine like terms: 3.041381265 + 4.5 = 7.541381265 y = 7.541381265 Simplifying y = 7.541381265

Subproblem 2

y + -4.5 = -3.041381265 Simplifying y + -4.5 = -3.041381265 Reorder the terms: -4.5 + y = -3.041381265 Solving -4.5 + y = -3.041381265 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 = -3.041381265 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -3.041381265 + 4.5 y = -3.041381265 + 4.5 Combine like terms: -3.041381265 + 4.5 = 1.458618735 y = 1.458618735 Simplifying y = 1.458618735

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.541381265, 1.458618735}

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