Question

find which of the following expressions is a factor of
y^7-128

Answer 1

\[y-2\] is one factor

Answer 2

but how do i know...can you show me some work?? thank you

Answer 3

it helps to know that
\[2^7=128\]

Answer 4

then you have
\[x^7-2^7\]

Answer 5

Thank you Satellite73!

Answer 6

and i guess you are supposed to know that
\[a^7-b^7=(a-b)(a^6+a^5b+a^4b^2+a^3b^3+a^2b^4+ab^5+b^6)\]

Answer 7

yw

Answer 8

THANKS A LOT!