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