SOLUTION: How do you find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n

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Question 75055: How do you find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
9M^2-KN^2 K MUST=-49
PROOF
9M^2-(-49)N^2
9M^2+49N^2
(3M+7N)(3M-7N)
9M^2+21MN-21MN+49N^2
9M^2+49N^2