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Write the explicit formula for the geometric sequence. a1 = -5 a2 = 20 a3 = -80
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Mar 10, 2017
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Write the explicit formula for the geometric sequence.
a1 = -5 a2 = 20 a3 = -80
Mathematics
high-school
Nick Jones
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geometric is
an=(a1)(r^(n-1))
a1=first term
r=common ratio
so
a1=-5, given
a2=20 so
a2=20=-5(r^(2-1))
20=-5(r^1)
20=-5(r)
divide both sides by -5
-4=r
the formula is
an=-5(-4)^(n-1)
Nicholas Farmer
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Mar 16, 2017
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Nicholas Farmer
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