y^2-17y+55=0

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Solution for y^2-17y+55=0 equation:


Simplifying
y2 + -17y + 55 = 0

Reorder the terms:
55 + -17y + y2 = 0

Solving
55 + -17y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-55' to each side of the equation.
55 + -17y + -55 + y2 = 0 + -55

Reorder the terms:
55 + -55 + -17y + y2 = 0 + -55

Combine like terms: 55 + -55 = 0
0 + -17y + y2 = 0 + -55
-17y + y2 = 0 + -55

Combine like terms: 0 + -55 = -55
-17y + y2 = -55

The y term is -17y.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17y + 72.25 + y2 = -55 + 72.25

Reorder the terms:
72.25 + -17y + y2 = -55 + 72.25

Combine like terms: -55 + 72.25 = 17.25
72.25 + -17y + y2 = 17.25

Factor a perfect square on the left side:
(y + -8.5)(y + -8.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(y + -8.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

y + -8.5 = 4.153311931 Simplifying y + -8.5 = 4.153311931 Reorder the terms: -8.5 + y = 4.153311931 Solving -8.5 + y = 4.153311931 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + y = 4.153311931 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + y = 4.153311931 + 8.5 y = 4.153311931 + 8.5 Combine like terms: 4.153311931 + 8.5 = 12.653311931 y = 12.653311931 Simplifying y = 12.653311931

Subproblem 2

y + -8.5 = -4.153311931 Simplifying y + -8.5 = -4.153311931 Reorder the terms: -8.5 + y = -4.153311931 Solving -8.5 + y = -4.153311931 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + y = -4.153311931 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + y = -4.153311931 + 8.5 y = -4.153311931 + 8.5 Combine like terms: -4.153311931 + 8.5 = 4.346688069 y = 4.346688069 Simplifying y = 4.346688069

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.653311931, 4.346688069}

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