Question

x+1/x=3,then how much is

Answer 1

\[x^7+1/x^7\]

Answer 2

\[x^2+2+1/x^2=3^2\]
\[x^2+1/x^2=7\]

Answer 3

\[x^3+y^3=(x+y)(x^2-xy+y^2)\]
\[x^3+1/x^3=(3)(7)=21\]

Answer 4

can i make this a sequence
\[3,7,21,...\]

Answer 5

sorry \[(3)(7-1)=18\]
\[3,7,18..\]

Answer 6

\[x^4+1/x^4=49-2=47\]