SOLUTION: PLease can someone explain this to me? Evaluate: (a-2b)(a+2b)

SOLUTION: PLease can someone explain this to me? Evaluate: (a-2b)(a+2b)

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Question 25391: PLease can someone explain this to me?
Evaluate: (a-2b)(a+2b)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Use the FOIL method:
F: a*a=a^2
O: a(2b)=+2ab
I:-2b(a)=-2ab
L:-2b(2b)=-4b^2
Add these to get:
a^2-4b^2
Cheers,
Stan H.
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