y^2-7y+7=0

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Solution for y^2-7y+7=0 equation: 


Simplifying
y2 + -7y + 7 = 0

Reorder the terms:
7 + -7y + y2 = 0

Solving
7 + -7y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -7y + -7 + y2 = 0 + -7

Reorder the terms:
7 + -7 + -7y + y2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -7y + y2 = 0 + -7
-7y + y2 = 0 + -7

Combine like terms: 0 + -7 = -7
-7y + y2 = -7

The y term is -7y.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y + 12.25 + y2 = -7 + 12.25

Reorder the terms:
12.25 + -7y + y2 = -7 + 12.25

Combine like terms: -7 + 12.25 = 5.25
12.25 + -7y + y2 = 5.25

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(y + -3.5) equal to 2.291287847 and -2.291287847.


Subproblem 1
y + -3.5 = 2.291287847

Simplifying
y + -3.5 = 2.291287847

Reorder the terms:
-3.5 + y = 2.291287847

Solving
-3.5 + y = 2.291287847

Solving for variable 'y'.

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

Add '3.5' to each side of the equation.
-3.5 + 3.5 + y = 2.291287847 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + y = 2.291287847 + 3.5
y = 2.291287847 + 3.5

Combine like terms: 2.291287847 + 3.5 = 5.791287847
y = 5.791287847

Simplifying
y = 5.791287847


Subproblem 2
y + -3.5 = -2.291287847

Simplifying
y + -3.5 = -2.291287847

Reorder the terms:
-3.5 + y = -2.291287847

Solving
-3.5 + y = -2.291287847

Solving for variable 'y'.

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

Add '3.5' to each side of the equation.
-3.5 + 3.5 + y = -2.291287847 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + y = -2.291287847 + 3.5
y = -2.291287847 + 3.5

Combine like terms: -2.291287847 + 3.5 = 1.208712153
y = 1.208712153

Simplifying
y = 1.208712153


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {5.791287847, 1.208712153}

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