(y+1)(y+4)=6

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Solution for (y+1)(y+4)=6 equation:


Simplifying
(y + 1)(y + 4) = 6

Reorder the terms:
(1 + y)(y + 4) = 6

Reorder the terms:
(1 + y)(4 + y) = 6

Multiply (1 + y) * (4 + y)
(1(4 + y) + y(4 + y)) = 6
((4 * 1 + y * 1) + y(4 + y)) = 6
((4 + 1y) + y(4 + y)) = 6
(4 + 1y + (4 * y + y * y)) = 6
(4 + 1y + (4y + y2)) = 6

Combine like terms: 1y + 4y = 5y
(4 + 5y + y2) = 6

Solving
4 + 5y + y2 = 6

Solving for variable 'y'.

Reorder the terms:
4 + -6 + 5y + y2 = 6 + -6

Combine like terms: 4 + -6 = -2
-2 + 5y + y2 = 6 + -6

Combine like terms: 6 + -6 = 0
-2 + 5y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 5y + 2 + y2 = 0 + 2

Reorder the terms:
-2 + 2 + 5y + y2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 5y + y2 = 0 + 2
5y + y2 = 0 + 2

Combine like terms: 0 + 2 = 2
5y + y2 = 2

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 = 2 + 6.25

Reorder the terms:
6.25 + 5y + y2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + 5y + y2 = 8.25

Factor a perfect square on the left side:
(y + 2.5)(y + 2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(y + 2.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

y + 2.5 = 2.872281323 Simplifying y + 2.5 = 2.872281323 Reorder the terms: 2.5 + y = 2.872281323 Solving 2.5 + y = 2.872281323 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 = 2.872281323 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = 2.872281323 + -2.5 y = 2.872281323 + -2.5 Combine like terms: 2.872281323 + -2.5 = 0.372281323 y = 0.372281323 Simplifying y = 0.372281323

Subproblem 2

y + 2.5 = -2.872281323 Simplifying y + 2.5 = -2.872281323 Reorder the terms: 2.5 + y = -2.872281323 Solving 2.5 + y = -2.872281323 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 = -2.872281323 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + y = -2.872281323 + -2.5 y = -2.872281323 + -2.5 Combine like terms: -2.872281323 + -2.5 = -5.372281323 y = -5.372281323 Simplifying y = -5.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.372281323, -5.372281323}

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