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Verified answer
Mapel: MatematikaBab: Barisan dan Deret
ar²=8.......(1)
U₅=32
ar⁴=32.......(2)
substitusikan r=2 ke persamaan(1)
ar²=8
a(2)²=8
4a=8
a=2
S₉=a(rⁿ-1) per r-1
=2(2⁹-1) per 2-1
=2¹⁰-2
=1024-2
=1022
semoga membantu....