8(3y-2)=y(y+2)+4

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Solution for 8(3y-2)=y(y+2)+4 equation:


Simplifying
8(3y + -2) = y(y + 2) + 4

Reorder the terms:
8(-2 + 3y) = y(y + 2) + 4
(-2 * 8 + 3y * 8) = y(y + 2) + 4
(-16 + 24y) = y(y + 2) + 4

Reorder the terms:
-16 + 24y = y(2 + y) + 4
-16 + 24y = (2 * y + y * y) + 4
-16 + 24y = (2y + y2) + 4

Reorder the terms:
-16 + 24y = 4 + 2y + y2

Solving
-16 + 24y = 4 + 2y + y2

Solving for variable 'y'.

Reorder the terms:
-16 + -4 + 24y + -2y + -1y2 = 4 + 2y + y2 + -4 + -2y + -1y2

Combine like terms: -16 + -4 = -20
-20 + 24y + -2y + -1y2 = 4 + 2y + y2 + -4 + -2y + -1y2

Combine like terms: 24y + -2y = 22y
-20 + 22y + -1y2 = 4 + 2y + y2 + -4 + -2y + -1y2

Reorder the terms:
-20 + 22y + -1y2 = 4 + -4 + 2y + -2y + y2 + -1y2

Combine like terms: 4 + -4 = 0
-20 + 22y + -1y2 = 0 + 2y + -2y + y2 + -1y2
-20 + 22y + -1y2 = 2y + -2y + y2 + -1y2

Combine like terms: 2y + -2y = 0
-20 + 22y + -1y2 = 0 + y2 + -1y2
-20 + 22y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-20 + 22y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
20 + -22y + y2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -22y + -20 + y2 = 0 + -20

Reorder the terms:
20 + -20 + -22y + y2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -22y + y2 = 0 + -20
-22y + y2 = 0 + -20

Combine like terms: 0 + -20 = -20
-22y + y2 = -20

The y term is -22y.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22y + 121 + y2 = -20 + 121

Reorder the terms:
121 + -22y + y2 = -20 + 121

Combine like terms: -20 + 121 = 101
121 + -22y + y2 = 101

Factor a perfect square on the left side:
(y + -11)(y + -11) = 101

Calculate the square root of the right side: 10.049875621

Break this problem into two subproblems by setting 
(y + -11) equal to 10.049875621 and -10.049875621.

Subproblem 1

y + -11 = 10.049875621 Simplifying y + -11 = 10.049875621 Reorder the terms: -11 + y = 10.049875621 Solving -11 + y = 10.049875621 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + y = 10.049875621 + 11 Combine like terms: -11 + 11 = 0 0 + y = 10.049875621 + 11 y = 10.049875621 + 11 Combine like terms: 10.049875621 + 11 = 21.049875621 y = 21.049875621 Simplifying y = 21.049875621

Subproblem 2

y + -11 = -10.049875621 Simplifying y + -11 = -10.049875621 Reorder the terms: -11 + y = -10.049875621 Solving -11 + y = -10.049875621 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + y = -10.049875621 + 11 Combine like terms: -11 + 11 = 0 0 + y = -10.049875621 + 11 y = -10.049875621 + 11 Combine like terms: -10.049875621 + 11 = 0.950124379 y = 0.950124379 Simplifying y = 0.950124379

Solution

The solution to the problem is based on the solutions from the subproblems. y = {21.049875621, 0.950124379}

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