2y^2-18y-6=y^2-3y

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Solution for 2y^2-18y-6=y^2-3y equation:


Simplifying
2y2 + -18y + -6 = y2 + -3y

Reorder the terms:
-6 + -18y + 2y2 = y2 + -3y

Reorder the terms:
-6 + -18y + 2y2 = -3y + y2

Solving
-6 + -18y + 2y2 = -3y + y2

Solving for variable 'y'.

Reorder the terms:
-6 + -18y + 3y + 2y2 + -1y2 = -3y + y2 + 3y + -1y2

Combine like terms: -18y + 3y = -15y
-6 + -15y + 2y2 + -1y2 = -3y + y2 + 3y + -1y2

Combine like terms: 2y2 + -1y2 = 1y2
-6 + -15y + 1y2 = -3y + y2 + 3y + -1y2

Reorder the terms:
-6 + -15y + 1y2 = -3y + 3y + y2 + -1y2

Combine like terms: -3y + 3y = 0
-6 + -15y + 1y2 = 0 + y2 + -1y2
-6 + -15y + 1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-6 + -15y + 1y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -15y + 6 + y2 = 0 + 6

Reorder the terms:
-6 + 6 + -15y + y2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -15y + y2 = 0 + 6
-15y + y2 = 0 + 6

Combine like terms: 0 + 6 = 6
-15y + y2 = 6

The y term is -15y.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15y + 56.25 + y2 = 6 + 56.25

Reorder the terms:
56.25 + -15y + y2 = 6 + 56.25

Combine like terms: 6 + 56.25 = 62.25
56.25 + -15y + y2 = 62.25

Factor a perfect square on the left side:
(y + -7.5)(y + -7.5) = 62.25

Calculate the square root of the right side: 7.889866919

Break this problem into two subproblems by setting 
(y + -7.5) equal to 7.889866919 and -7.889866919.

Subproblem 1

y + -7.5 = 7.889866919 Simplifying y + -7.5 = 7.889866919 Reorder the terms: -7.5 + y = 7.889866919 Solving -7.5 + y = 7.889866919 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + y = 7.889866919 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + y = 7.889866919 + 7.5 y = 7.889866919 + 7.5 Combine like terms: 7.889866919 + 7.5 = 15.389866919 y = 15.389866919 Simplifying y = 15.389866919

Subproblem 2

y + -7.5 = -7.889866919 Simplifying y + -7.5 = -7.889866919 Reorder the terms: -7.5 + y = -7.889866919 Solving -7.5 + y = -7.889866919 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + y = -7.889866919 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + y = -7.889866919 + 7.5 y = -7.889866919 + 7.5 Combine like terms: -7.889866919 + 7.5 = -0.389866919 y = -0.389866919 Simplifying y = -0.389866919

Solution

The solution to the problem is based on the solutions from the subproblems. y = {15.389866919, -0.389866919}

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