y^2-6y-9=4y-12

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Solution for y^2-6y-9=4y-12 equation:


Simplifying
y2 + -6y + -9 = 4y + -12

Reorder the terms:
-9 + -6y + y2 = 4y + -12

Reorder the terms:
-9 + -6y + y2 = -12 + 4y

Solving
-9 + -6y + y2 = -12 + 4y

Solving for variable 'y'.

Reorder the terms:
-9 + 12 + -6y + -4y + y2 = -12 + 4y + 12 + -4y

Combine like terms: -9 + 12 = 3
3 + -6y + -4y + y2 = -12 + 4y + 12 + -4y

Combine like terms: -6y + -4y = -10y
3 + -10y + y2 = -12 + 4y + 12 + -4y

Reorder the terms:
3 + -10y + y2 = -12 + 12 + 4y + -4y

Combine like terms: -12 + 12 = 0
3 + -10y + y2 = 0 + 4y + -4y
3 + -10y + y2 = 4y + -4y

Combine like terms: 4y + -4y = 0
3 + -10y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -10y + -3 + y2 = 0 + -3

Reorder the terms:
3 + -3 + -10y + y2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -10y + y2 = 0 + -3
-10y + y2 = 0 + -3

Combine like terms: 0 + -3 = -3
-10y + y2 = -3

The y term is -10y.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10y + 25 + y2 = -3 + 25

Reorder the terms:
25 + -10y + y2 = -3 + 25

Combine like terms: -3 + 25 = 22
25 + -10y + y2 = 22

Factor a perfect square on the left side:
(y + -5)(y + -5) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(y + -5) equal to 4.69041576 and -4.69041576.

Subproblem 1

y + -5 = 4.69041576 Simplifying y + -5 = 4.69041576 Reorder the terms: -5 + y = 4.69041576 Solving -5 + y = 4.69041576 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = 4.69041576 + 5 Combine like terms: -5 + 5 = 0 0 + y = 4.69041576 + 5 y = 4.69041576 + 5 Combine like terms: 4.69041576 + 5 = 9.69041576 y = 9.69041576 Simplifying y = 9.69041576

Subproblem 2

y + -5 = -4.69041576 Simplifying y + -5 = -4.69041576 Reorder the terms: -5 + y = -4.69041576 Solving -5 + y = -4.69041576 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = -4.69041576 + 5 Combine like terms: -5 + 5 = 0 0 + y = -4.69041576 + 5 y = -4.69041576 + 5 Combine like terms: -4.69041576 + 5 = 0.30958424 y = 0.30958424 Simplifying y = 0.30958424

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.69041576, 0.30958424}

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