y^2-9y+10=0

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Solution for y^2-9y+10=0 equation:


Simplifying
y2 + -9y + 10 = 0

Reorder the terms:
10 + -9y + y2 = 0

Solving
10 + -9y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + -9y + -10 + y2 = 0 + -10

Reorder the terms:
10 + -10 + -9y + y2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + -9y + y2 = 0 + -10
-9y + y2 = 0 + -10

Combine like terms: 0 + -10 = -10
-9y + y2 = -10

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 = -10 + 20.25

Reorder the terms:
20.25 + -9y + y2 = -10 + 20.25

Combine like terms: -10 + 20.25 = 10.25
20.25 + -9y + y2 = 10.25

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(y + -4.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

y + -4.5 = 3.201562119 Simplifying y + -4.5 = 3.201562119 Reorder the terms: -4.5 + y = 3.201562119 Solving -4.5 + y = 3.201562119 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 = 3.201562119 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 3.201562119 + 4.5 y = 3.201562119 + 4.5 Combine like terms: 3.201562119 + 4.5 = 7.701562119 y = 7.701562119 Simplifying y = 7.701562119

Subproblem 2

y + -4.5 = -3.201562119 Simplifying y + -4.5 = -3.201562119 Reorder the terms: -4.5 + y = -3.201562119 Solving -4.5 + y = -3.201562119 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 = -3.201562119 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -3.201562119 + 4.5 y = -3.201562119 + 4.5 Combine like terms: -3.201562119 + 4.5 = 1.298437881 y = 1.298437881 Simplifying y = 1.298437881

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.701562119, 1.298437881}

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