Question

If a-1/a=3,find a3-1/a3=?
show it step by step please​

Answer 1

THE ANSWER IS HERE,

$= > \: a - \frac{1}{a} = 3$

Cubing on both sides.

$= > \: {(a - \frac{1}{a} )}^{3} = {a}^{3} - ({ \frac{1}{a}) }^{3} - 3a( \frac{1}{a} )(a - \frac{1}{a} )$

$= > \: \: {3}^{3 } = {a}^{3} - ( { \frac{1}{a} )}^{3} - 3(3)$

$= > \: {a}^{3} - {( \frac{1}{a} )}^{3} = 27 +9 = 36$

So, The answer is 36.

Answer 2

Answer:

36

Step-by-step explanation:

Answer is in the image.