Question

x-1/x=7 then x3-1/x3​

Answer 1

x-1/x=7

by cross multiplication

x-1=7x

-1=7x-x

-1=6x

-1/6=x

then,

$x {}^{3} - 1 \div x {}^{3}$

$( - 1 \div 6) {}^{3} - 1 \div (- 1 \div 6) {}^{3}$

$0.162037037$