SOLUTION: Sn=a(subscript1)x(1-r^n/1-r) is the formula if given are positive= 1/9+8/9+etc. But what if the given are negative= -1-8-64-512...-(8)^n-1 or subtraction. Is the formula the same?

SOLUTION: Sn=a(subscript1)x(1-r^n/1-r) is the formula if given are positive= 1/9+8/9+etc. But what if the given are negative= -1-8-64-512...-(8)^n-1 or subtraction. Is the formula the same?

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Question 1132939: Sn=a(subscript1)x(1-r^n/1-r) is the formula if given are positive= 1/9+8/9+etc.
But what if the given are negative= -1-8-64-512...-(8)^n-1 or subtraction. Is the formula the same? or do is it flip and turn int0 a1x(1+r^n/1+r)?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

if you would use
if you would use
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