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Algebra 2 – Unit 4Name: _________________________________________Lesson 20.1-20.2 PracticeDate: ___________________ Period: __________right273050Explicit Formula: an=a1 ?r n-1 Recursive Formula : an=r ?an-1 Partial Sum Formula: Sn= a1(1-rn1-r) 00Explicit Formula: an=a1 ?r n-1 Recursive Formula : an=r ?an-1 Partial Sum Formula: Sn= a1(1-rn1-r) Geometric:Determine if the sequence is arithmetic, geometric, or neither. If arithmetic, state the common difference. If geometric, state the common ratio.3, 6, 9, 12, 15,…b. 2, 8, 32, 128, 512,… -25, 5, -1,15, -125,… d. 6, -12, -24, 48, -96,…For each sequence, find an, then find a8.3, 9, 27, 81,… b. 64, -32, 16, -8,…Write the explicit formula an for each geometric sequence. Then, evaluate a10.6, 18, 54, 162,… b. 2, -10, 50, -250,…Find the indicated partial sum for each geometric series.4+8+16+32+…; S12b. 200-100+50-25+…; S8-2-6-18-54-…; S10d. -3+12-48+192-…; S12 ................
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