To find another factor of the expression y² + 10y + 24, we can start by using the given information that one of the factors is (y + 4).
We can perform polynomial division to divide y² + 10y + 24 by (y + 4). Here’s how it works:
- Set up the division:
 
       y + 4 | y² + 10y + 24
- Determine what you need to multiply (y + 4) by to get the first term of the dividend:
 - Multiply y by (y + 4) to get y² + 4y.
 - Subtract this result from (y² + 10y + 24):
 
       y + 4 | y² + 10y + 24
                  - (y² + 4y)
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                       6y + 24
- Next, we have 6y + 24. Now, repeat the process:
 - Determine what you need to multiply (y + 4) by to match the first term of 6y:
 - You’ll multiply (6) by (y + 4): that gives you 6y + 24.
 - Subtract this from (6y + 24):
 
       y + 4 | y² + 10y + 24
                  - (y² + 4y)
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                       6y + 24
                      - (6y + 24)
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                             0
Since the remainder is 0, that means the division has been done correctly. Thus, the full factorization of the expression y² + 10y + 24 can be written as:
(y + 4)(y + 6) = y² + 10y + 24
From this, we conclude that another factor of y² + 10y + 24 is (y + 6).
In summary, the factors of the expression y² + 10y + 24 are (y + 4) and (y + 6).