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3. Simplify 2a+2/ a^2-1
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factor the top and bottom then simplify...
how do you factor it?
let's start with 2a + 2... what's common to both 2a and 2?
a^2
no. common to both 2a and 2 is the 2 . so you can factor the numerator as 2*(a+1)
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now factor the denominator... a^2 - 1. think of difference of squares -- how are difference of squares factored?
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