SOLUTION: Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n      Log On


   

Question 116476: Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
Take the product of the two given factors:
%283m+%2B+7n%29%283m+-7n%29

That would be 9m%5E2+-49n%5E2

I guess that means that k has to be 49, right???

R^2 Retired