Question

(r+1)^3

Answer 1

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What exactly is your question here?

Answer 2

so you dont know formula (a+b)^3 = ?

Answer 3

i dont know how to how to solve this.

Answer 4

you can calculi it so

(r+1)(r+1)(r+1) = (r+1)^2(r+1) = (r^2 +2r +1)(r+1)

hope this will help you

Answer 5

so isnt it r^3+2r^2+1r+1?

Answer 6

why 2r^2 ?

Answer 7

than you multiplie term by term you need getting 2r^2 +r^2 = 3r^2

right ?

Answer 8

so and 2r+r =3r

right ?