(y-7)(y+7)=9y

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Solution for (y-7)(y+7)=9y equation:


Simplifying
(y + -7)(y + 7) = 9y

Reorder the terms:
(-7 + y)(y + 7) = 9y

Reorder the terms:
(-7 + y)(7 + y) = 9y

Multiply (-7 + y) * (7 + y)
(-7(7 + y) + y(7 + y)) = 9y
((7 * -7 + y * -7) + y(7 + y)) = 9y
((-49 + -7y) + y(7 + y)) = 9y
(-49 + -7y + (7 * y + y * y)) = 9y
(-49 + -7y + (7y + y2)) = 9y

Combine like terms: -7y + 7y = 0
(-49 + 0 + y2) = 9y
(-49 + y2) = 9y

Solving
-49 + y2 = 9y

Solving for variable 'y'.

Reorder the terms:
-49 + -9y + y2 = 9y + -9y

Combine like terms: 9y + -9y = 0
-49 + -9y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + -9y + 49 + y2 = 0 + 49

Reorder the terms:
-49 + 49 + -9y + y2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + -9y + y2 = 0 + 49
-9y + y2 = 0 + 49

Combine like terms: 0 + 49 = 49
-9y + y2 = 49

The y term is -9y.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9y + 20.25 + y2 = 49 + 20.25

Reorder the terms:
20.25 + -9y + y2 = 49 + 20.25

Combine like terms: 49 + 20.25 = 69.25
20.25 + -9y + y2 = 69.25

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 69.25

Calculate the square root of the right side: 8.321658489

Break this problem into two subproblems by setting 
(y + -4.5) equal to 8.321658489 and -8.321658489.

Subproblem 1

y + -4.5 = 8.321658489 Simplifying y + -4.5 = 8.321658489 Reorder the terms: -4.5 + y = 8.321658489 Solving -4.5 + y = 8.321658489 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = 8.321658489 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 8.321658489 + 4.5 y = 8.321658489 + 4.5 Combine like terms: 8.321658489 + 4.5 = 12.821658489 y = 12.821658489 Simplifying y = 12.821658489

Subproblem 2

y + -4.5 = -8.321658489 Simplifying y + -4.5 = -8.321658489 Reorder the terms: -4.5 + y = -8.321658489 Solving -4.5 + y = -8.321658489 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + y = -8.321658489 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -8.321658489 + 4.5 y = -8.321658489 + 4.5 Combine like terms: -8.321658489 + 4.5 = -3.821658489 y = -3.821658489 Simplifying y = -3.821658489

Solution

The solution to the problem is based on the solutions from the subproblems. y = {12.821658489, -3.821658489}

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