y^2-7y+1=0

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Solution for y^2-7y+1=0 equation:


Simplifying
y2 + -7y + 1 = 0

Reorder the terms:
1 + -7y + y2 = 0

Solving
1 + -7y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -7y + -1 + y2 = 0 + -1

Reorder the terms:
1 + -1 + -7y + y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -7y + y2 = 0 + -1
-7y + y2 = 0 + -1

Combine like terms: 0 + -1 = -1
-7y + y2 = -1

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 = -1 + 12.25

Reorder the terms:
12.25 + -7y + y2 = -1 + 12.25

Combine like terms: -1 + 12.25 = 11.25
12.25 + -7y + y2 = 11.25

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = 11.25

Calculate the square root of the right side: 3.354101966

Break this problem into two subproblems by setting 
(y + -3.5) equal to 3.354101966 and -3.354101966.

Subproblem 1

y + -3.5 = 3.354101966 Simplifying y + -3.5 = 3.354101966 Reorder the terms: -3.5 + y = 3.354101966 Solving -3.5 + y = 3.354101966 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 = 3.354101966 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = 3.354101966 + 3.5 y = 3.354101966 + 3.5 Combine like terms: 3.354101966 + 3.5 = 6.854101966 y = 6.854101966 Simplifying y = 6.854101966

Subproblem 2

y + -3.5 = -3.354101966 Simplifying y + -3.5 = -3.354101966 Reorder the terms: -3.5 + y = -3.354101966 Solving -3.5 + y = -3.354101966 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 = -3.354101966 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = -3.354101966 + 3.5 y = -3.354101966 + 3.5 Combine like terms: -3.354101966 + 3.5 = 0.145898034 y = 0.145898034 Simplifying y = 0.145898034

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.854101966, 0.145898034}

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