(y-7)*(y+4)=6y

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Solution for (y-7)*(y+4)=6y equation:


Simplifying
(y + -7)(y + 4) = 6y

Reorder the terms:
(-7 + y)(y + 4) = 6y

Reorder the terms:
(-7 + y)(4 + y) = 6y

Multiply (-7 + y) * (4 + y)
(-7(4 + y) + y(4 + y)) = 6y
((4 * -7 + y * -7) + y(4 + y)) = 6y
((-28 + -7y) + y(4 + y)) = 6y
(-28 + -7y + (4 * y + y * y)) = 6y
(-28 + -7y + (4y + y2)) = 6y

Combine like terms: -7y + 4y = -3y
(-28 + -3y + y2) = 6y

Solving
-28 + -3y + y2 = 6y

Solving for variable 'y'.

Reorder the terms:
-28 + -3y + -6y + y2 = 6y + -6y

Combine like terms: -3y + -6y = -9y
-28 + -9y + y2 = 6y + -6y

Combine like terms: 6y + -6y = 0
-28 + -9y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -9y + 28 + y2 = 0 + 28

Reorder the terms:
-28 + 28 + -9y + y2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -9y + y2 = 0 + 28
-9y + y2 = 0 + 28

Combine like terms: 0 + 28 = 28
-9y + y2 = 28

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 = 28 + 20.25

Reorder the terms:
20.25 + -9y + y2 = 28 + 20.25

Combine like terms: 28 + 20.25 = 48.25
20.25 + -9y + y2 = 48.25

Factor a perfect square on the left side:
(y + -4.5)(y + -4.5) = 48.25

Calculate the square root of the right side: 6.946221995

Break this problem into two subproblems by setting 
(y + -4.5) equal to 6.946221995 and -6.946221995.

Subproblem 1

y + -4.5 = 6.946221995 Simplifying y + -4.5 = 6.946221995 Reorder the terms: -4.5 + y = 6.946221995 Solving -4.5 + y = 6.946221995 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 = 6.946221995 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = 6.946221995 + 4.5 y = 6.946221995 + 4.5 Combine like terms: 6.946221995 + 4.5 = 11.446221995 y = 11.446221995 Simplifying y = 11.446221995

Subproblem 2

y + -4.5 = -6.946221995 Simplifying y + -4.5 = -6.946221995 Reorder the terms: -4.5 + y = -6.946221995 Solving -4.5 + y = -6.946221995 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 = -6.946221995 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + y = -6.946221995 + 4.5 y = -6.946221995 + 4.5 Combine like terms: -6.946221995 + 4.5 = -2.446221995 y = -2.446221995 Simplifying y = -2.446221995

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.446221995, -2.446221995}

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