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Mathematics 18 Online
OpenStudy (anonymous):

Find an equation for the nth term of a geometric sequence where the second and fifth terms are -2 and 16, respectively.

zepdrix (zepdrix):

|dw:1398814247315:dw|Ok here is what they've told us about our sequence.

zepdrix (zepdrix):

Since the sequence is geometric, it will have the same multiple applied to it each time. So let's call this multiplier d,|dw:1398814316696:dw|Do you see how we had to multiply by d `three times` to get from -2 to 16?

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