y^2=18y+18

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Solution for y^2=18y+18 equation:


Simplifying
y2 = 18y + 18

Reorder the terms:
y2 = 18 + 18y

Solving
y2 = 18 + 18y

Solving for variable 'y'.

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

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

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

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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 = 18 + 81

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

Combine like terms: 18 + 81 = 99
81 + -18y + y2 = 99

Factor a perfect square on the left side:
(y + -9)(y + -9) = 99

Calculate the square root of the right side: 9.949874371

Break this problem into two subproblems by setting 
(y + -9) equal to 9.949874371 and -9.949874371.

Subproblem 1

y + -9 = 9.949874371 Simplifying y + -9 = 9.949874371 Reorder the terms: -9 + y = 9.949874371 Solving -9 + y = 9.949874371 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 = 9.949874371 + 9 Combine like terms: -9 + 9 = 0 0 + y = 9.949874371 + 9 y = 9.949874371 + 9 Combine like terms: 9.949874371 + 9 = 18.949874371 y = 18.949874371 Simplifying y = 18.949874371

Subproblem 2

y + -9 = -9.949874371 Simplifying y + -9 = -9.949874371 Reorder the terms: -9 + y = -9.949874371 Solving -9 + y = -9.949874371 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 = -9.949874371 + 9 Combine like terms: -9 + 9 = 0 0 + y = -9.949874371 + 9 y = -9.949874371 + 9 Combine like terms: -9.949874371 + 9 = -0.949874371 y = -0.949874371 Simplifying y = -0.949874371

Solution

The solution to the problem is based on the solutions from the subproblems. y = {18.949874371, -0.949874371}

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