Question 38174: A geometric sequenee has first term -4 and a constant ratio of 5.
a) Write the first six terms of this sequence.
_____,______,_____,_______,_______,_______
b) Find the sum of the first eight terms of this sequence
Answer by venugopalramana(3286)   (Show Source):
You can put this solution on YOUR website! A geometric sequenee has first term -4 and a constant ratio of 5.
a) Write the first six terms of this sequence.
A=-4...R=5
T1=A=-4
T2=AR=-4*5=-20
T3=A*R^2=-4*5^2=-100
T4=A*R^3=-500
T5=-2500
T6=--12500
_____,______,_____,_______,_______,_______
b) Find the sum of the first eight terms of this sequence
S8=A*{R^8-1)}/(R-1)=-4*(5^8-1)/(5-1)=-(5^8-1)
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