y^2-14y+20=0

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Solution for y^2-14y+20=0 equation: 


Simplifying
y2 + -14y + 20 = 0

Reorder the terms:
20 + -14y + y2 = 0

Solving
20 + -14y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -14y + -20 + y2 = 0 + -20

Reorder the terms:
20 + -20 + -14y + y2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -14y + y2 = 0 + -20
-14y + y2 = 0 + -20

Combine like terms: 0 + -20 = -20
-14y + y2 = -20

The y term is -14y.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14y + 49 + y2 = -20 + 49

Reorder the terms:
49 + -14y + y2 = -20 + 49

Combine like terms: -20 + 49 = 29
49 + -14y + y2 = 29

Factor a perfect square on the left side:
(y + -7)(y + -7) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(y + -7) equal to 5.385164807 and -5.385164807.


Subproblem 1
y + -7 = 5.385164807

Simplifying
y + -7 = 5.385164807

Reorder the terms:
-7 + y = 5.385164807

Solving
-7 + y = 5.385164807

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + y = 5.385164807 + 7

Combine like terms: -7 + 7 = 0
0 + y = 5.385164807 + 7
y = 5.385164807 + 7

Combine like terms: 5.385164807 + 7 = 12.385164807
y = 12.385164807

Simplifying
y = 12.385164807


Subproblem 2
y + -7 = -5.385164807

Simplifying
y + -7 = -5.385164807

Reorder the terms:
-7 + y = -5.385164807

Solving
-7 + y = -5.385164807

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + y = -5.385164807 + 7

Combine like terms: -7 + 7 = 0
0 + y = -5.385164807 + 7
y = -5.385164807 + 7

Combine like terms: -5.385164807 + 7 = 1.614835193
y = 1.614835193

Simplifying
y = 1.614835193


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {12.385164807, 1.614835193}

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