Question

simplify r^2-9/(r+3)^2

Answer 1

r^2 - 9 is example of difference of squares

--> a^2 - b^2 = (a+b)(a-b)
think of 9 as 3^2

Answer 2

sorry I don't understand what you are telling me

Answer 3

so would the answer be r^2/2r

Answer 4

no what i was getting at is you can write (r^2 -9) as (r+3)(r-3)

Answer 5

then you should notice that something cancels ...

Answer 6

ok so the r+3 cancles each other out.

Answer 7

yep...thus leaving the simplified answer :)

Answer 8

r-3

Answer 9

over (r+3)

remember it was squared, so only 1 cancelled

Answer 10

ok thank you

Answer 11

(r+3)^2 = (r+3)(r+3)

welcome