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Not always. Here's a statement that proves it wrong. 2 and 4 are a factor of 12. However, 8 is not a factor of twelve. In some cases though, it's right. 2 and 4 are a factor of 32. So is 8. So George is incorrect, it can only happen sometimes. Hope this helps.
Multiply 7 times 50 and 7 times 6 then add them
ex: [(7 X 50) + (7 X 6)]
4(d-1), if you expand it gets 4d-4.
