SOLUTION: I have started a new section in this class and am not understanding. Could someone explain this please? Multiply. Try to recognize the type of product before multiplying.

Question 380335: I have started a new section in this class and am not understanding. Could someone explain this please?
Multiply. Try to recognize the type of product before multiplying.

42. (4n + 7)(4n − 7)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
(4n + 7)(4n − 7)
Use FOIL:
F: 4n*4n = 16n^2
O: 4n*-7 = -28n
I: 7*4n = +28n
L: 7*-7 = -49
----------------
Combine these products to get:
16n^2-49
==================
Cheers,
Stan H.
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