Question

Solve. (a-1/a)(a+1/a)(a2+1/a2)for a = -2

Answer 1

(a-1/a) (a+1/a) (2a+1/2a)    

and it is for a =-2

so"    (-2+1/2)  (-2-1/2) (-4-1/4)................

  as  taking lcm of both

(-4+1/2) (-4-1/2) (-16-1/4) .....................

(-3/2) (-5/2) ( -17/4)

 hope it will help you