Question

factor plse
81r^6 - 3f^6 =

Answer 1

3*(27r^6 - f^6)=3*(3^3 (r^2)^3 -(f^2)^3)=
3(3r^2 - f^2)(9r^4-3r^2*f^2 + f^4)

Answer 2

inik can you be a little more detailed

Answer 3

i'll try...

Answer 4

remember, that:
27=3^3
r^6=(r^2)^3
f^6=(f^2)^3
and use formula for( a^3-b^3)

Answer 5

\[=3*((3r ^{2})^{3}-(f ^{2})^{3})=3(3r ^{2}+f ^{2})*(3^{2}r ^{4}-3r ^{2}f ^{2}+f ^{4})\]

is it better?

Answer 6

shooot!
it should be "-" : (3r^2 -f^2)
and plus in second parenthesis... (see formula for a^3-b^3)
please correct in your final answer

Answer 7

should be:
\[3(3r ^{2}-f ^{2})(9r ^{4}+3r ^{2}f ^{2}+f ^{4})\]