Question

If a + 1by a =6
Then a cube ×1 by a cube =?

Answer 1

Answer:

=×60

Step-by-step explanation:

done i hope it help

Answer 2

Answer:

198

Step-by-step explanation:

since

a+1/a=6 (1)

and (x+y)^3=x^3+y^3+3xy(x+y)

therefore

cubing (1) both sides , we get ,

(a+1/a)^3=216

a^3+1/a^3+3(a+1/a)=216

a^3+1/a^3+3*6=216

hence

a^3+1/a^3=198