42n2 is divisible by 14n. (42n2 ÷ 14n = 3n.)
Since the largest possible factor of 14n is itself, the greatest common factor is 14n.
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The gcf of 14n and 42n^2 is 14n.
Since the third term is negative, you need a positive and a negative factor, like this:(n + ...) (n - ...)Find two numbers that, when multiplied, give 72, and whose difference is 14. Just try the different factors of 72. If that doesn't work, use the quadratic formula. (Hint: it does work, in this case.)