Question

(a+1/a) 3 =3root3,then a 3 +1/a 3 equals ?

Answer 1

(a+1/a)³=3√3
or, a³+1/a³+3.a.1/a(a+1/a)=3√3
or, a³+1/a³+3√3=3√3 [∵, (a+1/a)³=3√3=(√3)³;∴, a+1/a=√3]
or, a³+1/a³=0

Answer 2

(a+1/a)³=3√3
or, a³+1/a³+3.a.1/a(a+1/a)=3√3
or, a³+1/a³+3√3=3√3 [∵, (a+1/a)³=3√3=(√3)³;∴, a+1/a=√3]
or, a³+1/a³=0
i think this is helpful.