yasmeenabutineh
What is the sum of a 6term geometric sequence if the first term is 11, the last term is –11,264 and the common ratio is –4?



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dumbcow
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\[\large s_{n} = \frac{a_{1}(r^{n}1)}{r1}\]

dumbcow
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n =6
a1 = 11
r = 4

dumbcow
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does that make sense?

yasmeenabutineh
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sn=11(41)/41?

dumbcow
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yes except the " 4" on top should be raised to the 6th power

yasmeenabutineh
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okay so 4^61?

dumbcow
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yep

dumbcow
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make sure you include the negative sign when raising to power.....4^6 is different than (4)^6