tentukan barisan geometri
diketahui= u1=3. u5=768. ditanya= a.rasio? b.u7?
diketahui= u1=3. u5=768. ditanya= a.rasio? b.u7?
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suku ke-n geometri = ar^n-1
a. rasio = ?
U5 = 3×r⁴
768÷3 = r⁴
r = ⁴√256 = 4
b. U7=?
U7=3×4⁶ = 12288