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Verified answer
MAPEL = MATEMATIKAKELAS = 9
BAB = BARISAN & DERET
diketahui :
a = 2 + 2√2
r = U2 ÷ U1
= 4 + 4√2 ÷ 2 + 2√2
= 2
ditanya = jumlah 12 suku (S12) ??
---------- Deret Geometri ---------
S12 = a( rⁿ - 1 )/( r - 1 )
S12 = 2 + 2√2( 2¹² - 1 )/( 2 - 1 )
S12 = 2 + 2√2( 4096 - 1 )/( 1 )
S12 = 2 + 2√2( 4095 )
S12 = 8190 + 8190√2
jadi, jumlah 12 suku dari barisan geometri tersebut = 8190 + 8190√2
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