Book Maths Puzzle Algebra

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x^2+7x+12

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Book Other Question

1) use four fours to create 65, and you can use any mathematical symbols, but you can only use four fours as your digits.
2) find four #'s, the sum of which is 45, so that if 2 is added to the first #, 2 is subtracted from the second #, the third is multiplied by 2 and the fourth # is divided by 2, then thr four #'s produced are all the same. Right now, Alan's mother is 4 times older than he is. In 4 years, she will be 3 times older than he is. How old are Alan and his mother right now?

Second question:

Kim is using a list of his friends' ages. He adds two of his friends' ages and gets 17. He multiplies the ages and gets 72. How old are his two friends?

I would appreciate your help. Thanks.

-- Mary