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general formula for a geometric progression is a x r^(n-1)
a is the first term which is -1
r is the common ratio which is -2
goal is to find n when a x r^(n-1)=-16777216
-1 x (-2)^(n-1)=-16777216 multiply by -1
(-2)^(n-1)=16777216 then use logs
log2(16777216)=n-1
n=log2(16777216)+1
n=25
a is the first term which is -1
r is the common ratio which is -2
goal is to find n when a x r^(n-1)=-16777216
-1 x (-2)^(n-1)=-16777216 multiply by -1
(-2)^(n-1)=16777216 then use logs
log2(16777216)=n-1
n=log2(16777216)+1
n=25
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