y^2-6y=47

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Solution for y^2-6y=47 equation:


Simplifying
y2 + -6y = 47

Reorder the terms:
-6y + y2 = 47

Solving
-6y + y2 = 47

Solving for variable 'y'.

Reorder the terms:
-47 + -6y + y2 = 47 + -47

Combine like terms: 47 + -47 = 0
-47 + -6y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '47' to each side of the equation.
-47 + -6y + 47 + y2 = 0 + 47

Reorder the terms:
-47 + 47 + -6y + y2 = 0 + 47

Combine like terms: -47 + 47 = 0
0 + -6y + y2 = 0 + 47
-6y + y2 = 0 + 47

Combine like terms: 0 + 47 = 47
-6y + y2 = 47

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = 47 + 9

Reorder the terms:
9 + -6y + y2 = 47 + 9

Combine like terms: 47 + 9 = 56
9 + -6y + y2 = 56

Factor a perfect square on the left side:
(y + -3)(y + -3) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(y + -3) equal to 7.483314774 and -7.483314774.

Subproblem 1

y + -3 = 7.483314774 Simplifying y + -3 = 7.483314774 Reorder the terms: -3 + y = 7.483314774 Solving -3 + y = 7.483314774 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 7.483314774 + 3 Combine like terms: -3 + 3 = 0 0 + y = 7.483314774 + 3 y = 7.483314774 + 3 Combine like terms: 7.483314774 + 3 = 10.483314774 y = 10.483314774 Simplifying y = 10.483314774

Subproblem 2

y + -3 = -7.483314774 Simplifying y + -3 = -7.483314774 Reorder the terms: -3 + y = -7.483314774 Solving -3 + y = -7.483314774 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -7.483314774 + 3 Combine like terms: -3 + 3 = 0 0 + y = -7.483314774 + 3 y = -7.483314774 + 3 Combine like terms: -7.483314774 + 3 = -4.483314774 y = -4.483314774 Simplifying y = -4.483314774

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.483314774, -4.483314774}

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