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Geometric Series Qu!
2) The sum of the first three terms of a geometric series is 30.5. If the first term is 8, find possible values of r.
How do I begin to answer this guys,
I've tried using: a+ar+ar^2=30.5
And then trying to factorise but it's very arkward, how can i do it, thanks
How do I begin to answer this guys,
I've tried using: a+ar+ar^2=30.5
And then trying to factorise but it's very arkward, how can i do it, thanks
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