2y(y+5)=27

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Solution for 2y(y+5)=27 equation:


Simplifying
2y(y + 5) = 27

Reorder the terms:
2y(5 + y) = 27
(5 * 2y + y * 2y) = 27
(10y + 2y2) = 27

Solving
10y + 2y2 = 27

Solving for variable 'y'.

Reorder the terms:
-27 + 10y + 2y2 = 27 + -27

Combine like terms: 27 + -27 = 0
-27 + 10y + 2y2 = 0

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

Divide each side by '2'.
-13.5 + 5y + y2 = 0

Move the constant term to the right:

Add '13.5' to each side of the equation.
-13.5 + 5y + 13.5 + y2 = 0 + 13.5

Reorder the terms:
-13.5 + 13.5 + 5y + y2 = 0 + 13.5

Combine like terms: -13.5 + 13.5 = 0.0
0.0 + 5y + y2 = 0 + 13.5
5y + y2 = 0 + 13.5

Combine like terms: 0 + 13.5 = 13.5
5y + y2 = 13.5

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 = 13.5 + 6.25

Reorder the terms:
6.25 + 5y + y2 = 13.5 + 6.25

Combine like terms: 13.5 + 6.25 = 19.75
6.25 + 5y + y2 = 19.75

Factor a perfect square on the left side:
(y + 2.5)(y + 2.5) = 19.75

Calculate the square root of the right side: 4.444097209

Break this problem into two subproblems by setting 
(y + 2.5) equal to 4.444097209 and -4.444097209.

Subproblem 1

y + 2.5 = 4.444097209 Simplifying y + 2.5 = 4.444097209 Reorder the terms: 2.5 + y = 4.444097209 Solving 2.5 + y = 4.444097209 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 = 4.444097209 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = 4.444097209 + -2.5 y = 4.444097209 + -2.5 Combine like terms: 4.444097209 + -2.5 = 1.944097209 y = 1.944097209 Simplifying y = 1.944097209

Subproblem 2

y + 2.5 = -4.444097209 Simplifying y + 2.5 = -4.444097209 Reorder the terms: 2.5 + y = -4.444097209 Solving 2.5 + y = -4.444097209 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 = -4.444097209 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = -4.444097209 + -2.5 y = -4.444097209 + -2.5 Combine like terms: -4.444097209 + -2.5 = -6.944097209 y = -6.944097209 Simplifying y = -6.944097209

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.944097209, -6.944097209}

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