Tolong bantu jawab, pakai cara​

Diket

U5 = 48

U8 = 384

Ditanya = U3…?

Jawab

U8 = a × r^7 = 384

U5 = a × r^4 = 48 ÷

r³ = 8

r = ³√8

r = ³√2³

r = 2

a × r^4 = 48

a × (2)^4 = 48

a × 16 = 48

a = 48/16

a = 3

maka,

U3 = a × r²

= 3 × (2)²

= 3 × 4

= 12

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