(y-9)(y+8)=4y

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Solution for (y-9)(y+8)=4y equation:


Simplifying
(y + -9)(y + 8) = 4y

Reorder the terms:
(-9 + y)(y + 8) = 4y

Reorder the terms:
(-9 + y)(8 + y) = 4y

Multiply (-9 + y) * (8 + y)
(-9(8 + y) + y(8 + y)) = 4y
((8 * -9 + y * -9) + y(8 + y)) = 4y
((-72 + -9y) + y(8 + y)) = 4y
(-72 + -9y + (8 * y + y * y)) = 4y
(-72 + -9y + (8y + y2)) = 4y

Combine like terms: -9y + 8y = -1y
(-72 + -1y + y2) = 4y

Solving
-72 + -1y + y2 = 4y

Solving for variable 'y'.

Reorder the terms:
-72 + -1y + -4y + y2 = 4y + -4y

Combine like terms: -1y + -4y = -5y
-72 + -5y + y2 = 4y + -4y

Combine like terms: 4y + -4y = 0
-72 + -5y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + -5y + 72 + y2 = 0 + 72

Reorder the terms:
-72 + 72 + -5y + y2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -5y + y2 = 0 + 72
-5y + y2 = 0 + 72

Combine like terms: 0 + 72 = 72
-5y + y2 = 72

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 = 72 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 72 + 6.25

Combine like terms: 72 + 6.25 = 78.25
6.25 + -5y + y2 = 78.25

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(y + -2.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

y + -2.5 = 8.845903006 Simplifying y + -2.5 = 8.845903006 Reorder the terms: -2.5 + y = 8.845903006 Solving -2.5 + y = 8.845903006 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 = 8.845903006 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 8.845903006 + 2.5 y = 8.845903006 + 2.5 Combine like terms: 8.845903006 + 2.5 = 11.345903006 y = 11.345903006 Simplifying y = 11.345903006

Subproblem 2

y + -2.5 = -8.845903006 Simplifying y + -2.5 = -8.845903006 Reorder the terms: -2.5 + y = -8.845903006 Solving -2.5 + y = -8.845903006 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 = -8.845903006 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -8.845903006 + 2.5 y = -8.845903006 + 2.5 Combine like terms: -8.845903006 + 2.5 = -6.345903006 y = -6.345903006 Simplifying y = -6.345903006

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.345903006, -6.345903006}

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