2y^2-15-15y=y^2-3y

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Solution for 2y^2-15-15y=y^2-3y equation:


Simplifying
2y2 + -15 + -15y = y2 + -3y

Reorder the terms:
-15 + -15y + 2y2 = y2 + -3y

Reorder the terms:
-15 + -15y + 2y2 = -3y + y2

Solving
-15 + -15y + 2y2 = -3y + y2

Solving for variable 'y'.

Reorder the terms:
-15 + -15y + 3y + 2y2 + -1y2 = -3y + y2 + 3y + -1y2

Combine like terms: -15y + 3y = -12y
-15 + -12y + 2y2 + -1y2 = -3y + y2 + 3y + -1y2

Combine like terms: 2y2 + -1y2 = 1y2
-15 + -12y + 1y2 = -3y + y2 + 3y + -1y2

Reorder the terms:
-15 + -12y + 1y2 = -3y + 3y + y2 + -1y2

Combine like terms: -3y + 3y = 0
-15 + -12y + 1y2 = 0 + y2 + -1y2
-15 + -12y + 1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-15 + -12y + 1y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -12y + 15 + y2 = 0 + 15

Reorder the terms:
-15 + 15 + -12y + y2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -12y + y2 = 0 + 15
-12y + y2 = 0 + 15

Combine like terms: 0 + 15 = 15
-12y + y2 = 15

The y term is -12y.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12y + 36 + y2 = 15 + 36

Reorder the terms:
36 + -12y + y2 = 15 + 36

Combine like terms: 15 + 36 = 51
36 + -12y + y2 = 51

Factor a perfect square on the left side:
(y + -6)(y + -6) = 51

Calculate the square root of the right side: 7.141428429

Break this problem into two subproblems by setting 
(y + -6) equal to 7.141428429 and -7.141428429.

Subproblem 1

y + -6 = 7.141428429 Simplifying y + -6 = 7.141428429 Reorder the terms: -6 + y = 7.141428429 Solving -6 + y = 7.141428429 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = 7.141428429 + 6 Combine like terms: -6 + 6 = 0 0 + y = 7.141428429 + 6 y = 7.141428429 + 6 Combine like terms: 7.141428429 + 6 = 13.141428429 y = 13.141428429 Simplifying y = 13.141428429

Subproblem 2

y + -6 = -7.141428429 Simplifying y + -6 = -7.141428429 Reorder the terms: -6 + y = -7.141428429 Solving -6 + y = -7.141428429 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = -7.141428429 + 6 Combine like terms: -6 + 6 = 0 0 + y = -7.141428429 + 6 y = -7.141428429 + 6 Combine like terms: -7.141428429 + 6 = -1.141428429 y = -1.141428429 Simplifying y = -1.141428429

Solution

The solution to the problem is based on the solutions from the subproblems. y = {13.141428429, -1.141428429}

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