Question

Please Help
Solve:
3 ^3square root sign 81 - 2 ^3square root sign 54

Answer 1

\[3\sqrt[3]{81} - 2\sqrt[3]{54}\]

Answer 2

find the perfect cube factorisation for each radicand
81=27*3
54=27*2

Answer 3

54 is not a cube, is it?

Answer 4

Oh nevermind

Answer 5

thanks!

Answer 6

You still won't be able to subtract anything though

Answer 7

this one too:

Answer 8

\[=9\sqrt[3]{3}-6\sqrt[3]{2}\]

Answer 9

\[\sqrt[4]{32} + \sqrt[4]{48}\]

Answer 10

32=16*2; 48=16*3 and 16 is 2^4

Answer 11

\[=\sqrt[4]{16*2}+\sqrt[4]{16*3}=2\sqrt[4]{2}+2\sqrt[4]{3}\]

Answer 12

thanks for the help!

Answer 13

welcome!