Dari barisan geometri diketahui u2= 5 dan u5= 45, maka u7= ? Tolong jawab... yg tadi kehapus

U2 = 5 = ar
U5 = 45 = ar⁴

r³ = 45/5 = 9
r = 3^(2/3)
a = 5 × 3^(-2/3)

U7 = ar^6
= 5 × 3^(-2/3) × (3^(2/3))^6
= 5 × 3^(10/3)