Answer:

the 8th term is 19683

Step-by-step explanation:

a2 =a1×r2-1 =a1×r1 =3×31 =9

a3 =a1×r3-1 =a1×r2 =3×32 =27

a4 =a1×r4-1 =a1×r3 =3×33 =81

a5 =a1×r5-1 =a1×r4 =3×34 =243

a6 =a1×r6-1 =a1×r5 =3×35 =729

a7 =a1×r7-1 =a1×r6 =3×36 =2187

a8 =a1×r8-1 =a1×r7 =3×37 =6561

a9 =a1×r9-1 =a1×r8 =3×38 =19683