Question

if y-1/y=6, what is the value of y3-1/y3

Answer 1

y-1=6y
-1=5y
y=-1/5
then -3/5-1/-3/5=
$\frac{ - 3}{5} \frac{ - 5}{5 } \div \frac{ - 3}{5 } = \frac{ - 8}{5} \div \frac{ - 3}{5} = \frac{ - 8}{5 } \times \frac{5}{ - 3} = \frac{8}{3}$
hope it helps you.