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The 6th term of a geometric sequence is 28, and the first term is -2, then the common ratio is______

label Algebra
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The 6th term of a geometric sequence is 28, and the first term is -2, then the common ratio is_________________ .

Dec 4th, 2014

The nth term of geometric sequence = the first term times the common ration taken to the (n-1) power

So, if the 6th term is 28,  the 28 = (-2)(r)^5

r^5 = 28/-2 = -14

r = (-14)^1/5 = -1.695

Dec 4th, 2014

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Dec 4th, 2014
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