VCabral1134
  • VCabral1134
Help me plz will fan and give medal! Write the explicit formula for the geometric sequence. Then find the fifth term in the sequence. a^1 = −3, a^2 = 15, a^3 = −75 a. an = −3 ⋅ (−5)n ; 9375 c. an = −3 ⋅ (5)n ; –1875 b. an = −5 ⋅ (−3)n − 1 ; –405 d. an = −3 ⋅ (−5)n − 1 ; –1875
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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Nnesha
  • Nnesha
\[\huge\rm a_n = a_1 \times r^{n-1}\] equation to find nth term of geometric seq. where a_1 is first term r= ratio n= term that u need
VCabral1134
  • VCabral1134
thank you
Nnesha
  • Nnesha
to find common ratio divide next term with the previous one \[\large\rm r=\frac{ a_2 }{ a_1}~~or~~\frac{ a_3 }{ a_2} \]

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Nnesha
  • Nnesha
a_2 = 2nd term a_3 = 3rd term
VCabral1134
  • VCabral1134
r=-5
VCabral1134
  • VCabral1134
D @Nnesha
VCabral1134
  • VCabral1134
Am I right??
Nnesha
  • Nnesha
let me check wait a sec
VCabral1134
  • VCabral1134
ok
Nnesha
  • Nnesha
right
VCabral1134
  • VCabral1134
Yay!!
Nnesha
  • Nnesha
yahoo!

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