5y(y+2)=54

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Solution for 5y(y+2)=54 equation:


Simplifying
5y(y + 2) = 54

Reorder the terms:
5y(2 + y) = 54
(2 * 5y + y * 5y) = 54
(10y + 5y2) = 54

Solving
10y + 5y2 = 54

Solving for variable 'y'.

Reorder the terms:
-54 + 10y + 5y2 = 54 + -54

Combine like terms: 54 + -54 = 0
-54 + 10y + 5y2 = 0

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

Divide each side by '5'.
-10.8 + 2y + y2 = 0

Move the constant term to the right:

Add '10.8' to each side of the equation.
-10.8 + 2y + 10.8 + y2 = 0 + 10.8

Reorder the terms:
-10.8 + 10.8 + 2y + y2 = 0 + 10.8

Combine like terms: -10.8 + 10.8 = 0.0
0.0 + 2y + y2 = 0 + 10.8
2y + y2 = 0 + 10.8

Combine like terms: 0 + 10.8 = 10.8
2y + y2 = 10.8

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 10.8 + 1

Reorder the terms:
1 + 2y + y2 = 10.8 + 1

Combine like terms: 10.8 + 1 = 11.8
1 + 2y + y2 = 11.8

Factor a perfect square on the left side:
(y + 1)(y + 1) = 11.8

Calculate the square root of the right side: 3.435112807

Break this problem into two subproblems by setting 
(y + 1) equal to 3.435112807 and -3.435112807.

Subproblem 1

y + 1 = 3.435112807 Simplifying y + 1 = 3.435112807 Reorder the terms: 1 + y = 3.435112807 Solving 1 + y = 3.435112807 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 3.435112807 + -1 Combine like terms: 1 + -1 = 0 0 + y = 3.435112807 + -1 y = 3.435112807 + -1 Combine like terms: 3.435112807 + -1 = 2.435112807 y = 2.435112807 Simplifying y = 2.435112807

Subproblem 2

y + 1 = -3.435112807 Simplifying y + 1 = -3.435112807 Reorder the terms: 1 + y = -3.435112807 Solving 1 + y = -3.435112807 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -3.435112807 + -1 Combine like terms: 1 + -1 = 0 0 + y = -3.435112807 + -1 y = -3.435112807 + -1 Combine like terms: -3.435112807 + -1 = -4.435112807 y = -4.435112807 Simplifying y = -4.435112807

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.435112807, -4.435112807}

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