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11 June, 04:38

Determine the 4th term in the geometric sequence whose first term is - 2 and whose common ratio is - 5

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  1. 11 June, 04:49
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    Again, any geometric sequence can be expressed as:

    a (n) = ar^ (n-1), a=initial term, r=common ratio, n=term number

    We are told that a=-2 and r=-5 so:

    a (4) = - 2 (-5) ^ (4-1)

    a (4) = - 2 (-5) ^3

    a (4) = 250
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