SOLUTION: Multiply: (a-2b)(a+2b)

Question 176960This question is from textbook
: Multiply: (a-2b)(a+2b) This question is from textbook

Found 2 solutions by jim_thompson5910, dini:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given expression.

Now let's FOIL the expression.

Remember, when you FOIL an expression, you follow this procedure:

Multiply the First terms:.

Multiply the Outer terms:.

Multiply the Inner terms:.

Multiply the Last terms:.

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Now collect every term to make a single expression.

Now combine like terms.

So FOILs to .

In other words, .

Note: this problem is an example of the use of difference of squares.
Answer by dini(5) (Show Source): You can put this solution on YOUR website!
(a-2b)*(a+2b)
=a^2+2ba-2ba-(2b)^2
=a^2-4b^2
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