SOLUTION: I need some help with this problem please. Find a value for k so that 9m^2 - kn^2 will have the factors 3m + 7n and 3m - 7n. I am not sure how to solve this can you help?

SOLUTION: I need some help with this problem please. Find a value for k so that 9m^2 - kn^2 will have the factors 3m + 7n and 3m - 7n. I am not sure how to solve this can you help?

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Question 95948: I need some help with this problem please.
Find a value for k so that 9m^2 - kn^2 will have the factors 3m + 7n and 3m - 7n.
I am not sure how to solve this can you help? Thank you.
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
The last integer of both factors is 7. Then k has to equal 7*7 or 49.

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