(y+3)(y-8)=9

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Solution for (y+3)(y-8)=9 equation:


Simplifying
(y + 3)(y + -8) = 9

Reorder the terms:
(3 + y)(y + -8) = 9

Reorder the terms:
(3 + y)(-8 + y) = 9

Multiply (3 + y) * (-8 + y)
(3(-8 + y) + y(-8 + y)) = 9
((-8 * 3 + y * 3) + y(-8 + y)) = 9
((-24 + 3y) + y(-8 + y)) = 9
(-24 + 3y + (-8 * y + y * y)) = 9
(-24 + 3y + (-8y + y2)) = 9

Combine like terms: 3y + -8y = -5y
(-24 + -5y + y2) = 9

Solving
-24 + -5y + y2 = 9

Solving for variable 'y'.

Reorder the terms:
-24 + -9 + -5y + y2 = 9 + -9

Combine like terms: -24 + -9 = -33
-33 + -5y + y2 = 9 + -9

Combine like terms: 9 + -9 = 0
-33 + -5y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '33' to each side of the equation.
-33 + -5y + 33 + y2 = 0 + 33

Reorder the terms:
-33 + 33 + -5y + y2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + -5y + y2 = 0 + 33
-5y + y2 = 0 + 33

Combine like terms: 0 + 33 = 33
-5y + y2 = 33

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = 33 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 33 + 6.25

Combine like terms: 33 + 6.25 = 39.25
6.25 + -5y + y2 = 39.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 39.25

Calculate the square root of the right side: 6.264982043

Break this problem into two subproblems by setting 
(y + -2.5) equal to 6.264982043 and -6.264982043.

Subproblem 1

y + -2.5 = 6.264982043 Simplifying y + -2.5 = 6.264982043 Reorder the terms: -2.5 + y = 6.264982043 Solving -2.5 + y = 6.264982043 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 6.264982043 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 6.264982043 + 2.5 y = 6.264982043 + 2.5 Combine like terms: 6.264982043 + 2.5 = 8.764982043 y = 8.764982043 Simplifying y = 8.764982043

Subproblem 2

y + -2.5 = -6.264982043 Simplifying y + -2.5 = -6.264982043 Reorder the terms: -2.5 + y = -6.264982043 Solving -2.5 + y = -6.264982043 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = -6.264982043 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -6.264982043 + 2.5 y = -6.264982043 + 2.5 Combine like terms: -6.264982043 + 2.5 = -3.764982043 y = -3.764982043 Simplifying y = -3.764982043

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.764982043, -3.764982043}

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