Question

what is the sum of the first 10 terms of the sequence defined by a^n=2^n-3

Answer 1

\[a_{n}=2n-3\]

Answer 2

a1=2*1-3=-1,a2=2*2-3=1
n=10
c.d d=1-(-1)=1+1=2
n=10
l=2*10-3=17
\[Sn=\frac{ n }{2}\left( a1+l \right)\]
plug the values and get S10

Answer 3

thanks!