SOLUTION: please help with this problem. Factor completely. x^2 + 4xy - 21y^2 thanks

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Question 6435: please help with this problem.
Factor completely.
x^2 + 4xy - 21y^2
thanks
Answer by sabanasir(22) About Me  (Show Source):
You can put this solution on YOUR website!
x^2 + 4xy - 21y^2
=> x^2 + 3xy - 7xy - 21y^2
=> x (x+3y) - 7y (x+3y)
=> (x+3y)(x-7y)