I need help with an algebra problem

label Algebra
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Dec 5th, 2015

Thank you for the opportunity to help you with your question!

i) S6=a1*(1-q^6)/(1-q) = (-1/3)*(1-(-1/3)^6)/(1-(-1/3))  = -1/3*(1-1/729)/(4/3)

=-1/4*728/729

=-182/729

ii)S9 = a1(1-q^9)/(1-q) = 3*4*(1-4^9)/(1-4)

=12*(4^9-1)/3 

=1048572

Please let me know if you need any clarification. I'm always happy to answer your questions.
Dec 5th, 2015

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