Find the factors of the following expressions:

(9) am + an + al + bm + bl + bn

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Solution

am + an + al + bm + bl + bn
We can factorise this expression as:
am + an + al + bm + bl + bn
= (am + an + al) + (bm + bl + bn)
= a (m + n + l) + b (m + n + l)
= (m + n + l) (a + b)

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