y^2-18y=41

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Solution for y^2-18y=41 equation:


Simplifying
y2 + -18y = 41

Reorder the terms:
-18y + y2 = 41

Solving
-18y + y2 = 41

Solving for variable 'y'.

Reorder the terms:
-41 + -18y + y2 = 41 + -41

Combine like terms: 41 + -41 = 0
-41 + -18y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '41' to each side of the equation.
-41 + -18y + 41 + y2 = 0 + 41

Reorder the terms:
-41 + 41 + -18y + y2 = 0 + 41

Combine like terms: -41 + 41 = 0
0 + -18y + y2 = 0 + 41
-18y + y2 = 0 + 41

Combine like terms: 0 + 41 = 41
-18y + y2 = 41

The y term is -18y.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18y + 81 + y2 = 41 + 81

Reorder the terms:
81 + -18y + y2 = 41 + 81

Combine like terms: 41 + 81 = 122
81 + -18y + y2 = 122

Factor a perfect square on the left side:
(y + -9)(y + -9) = 122

Calculate the square root of the right side: 11.045361017

Break this problem into two subproblems by setting 
(y + -9) equal to 11.045361017 and -11.045361017.

Subproblem 1

y + -9 = 11.045361017 Simplifying y + -9 = 11.045361017 Reorder the terms: -9 + y = 11.045361017 Solving -9 + y = 11.045361017 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + y = 11.045361017 + 9 Combine like terms: -9 + 9 = 0 0 + y = 11.045361017 + 9 y = 11.045361017 + 9 Combine like terms: 11.045361017 + 9 = 20.045361017 y = 20.045361017 Simplifying y = 20.045361017

Subproblem 2

y + -9 = -11.045361017 Simplifying y + -9 = -11.045361017 Reorder the terms: -9 + y = -11.045361017 Solving -9 + y = -11.045361017 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + y = -11.045361017 + 9 Combine like terms: -9 + 9 = 0 0 + y = -11.045361017 + 9 y = -11.045361017 + 9 Combine like terms: -11.045361017 + 9 = -2.045361017 y = -2.045361017 Simplifying y = -2.045361017

Solution

The solution to the problem is based on the solutions from the subproblems. y = {20.045361017, -2.045361017}

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