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Rasio suatu barisan geometri dengan U 1 ​ = − 16 dan U 8 ​ = 8 1 ​ adalah …

Rasio suatu barisan geometri dengan  dan  adalah …

  1. 2

  2. negative 2

  3. negative 1

  4. negative 1 half

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Pembahasan

Maka, rasionya adalah

U subscript 1 equals space – 16 rightwards arrow a space equals negative 16

Maka, rasionya adalah

table attributes columnalign right center left columnspacing 0px end attributes row cell space space space space space space space space space space space space space U subscript 8 end cell equals cell 1 over 8 end cell row cell space space space space space space space space space space space space a r to the power of 7 end cell equals cell 1 over 8 end cell row cell negative 16 space cross times space r to the power of 7 end cell equals cell 1 over 8 end cell row cell space space space space space space space space space space space space space space r to the power of 7 end cell equals cell 1 over 8 cross times fraction numerator 1 over denominator negative 16 end fraction end cell row cell space space space space space space space space space space space space space space r to the power of 7 end cell equals cell negative 1 over 128 end cell row cell space space space space space space space space space space space space space r to the power of 7 end cell equals cell negative 1 over 2 to the power of 7 end cell row cell space space space space space space space space space space space space space r to the power of 7 end cell equals cell negative open parentheses 1 half close parentheses to the power of 7 end cell row cell space space space space space space space space space space space space space space r space end cell equals cell negative 1 half end cell end table

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