Use the formula \displaystyle S_n=a_1\cdot \frac{1-r^{n}}{1-r}S
n

=a
1

⋅
1−r
1−r
n

to evaluate the following sum.
\displaystyle \sum_{k=1}^{7}\left(-10 \left(3\right)^{k}\right)
k=1
∑
7

(−10(3)
k
)

Question

ghostkie2005 ghostkie2005

08-11-2022
Mathematics

Answered

Use the formula \displaystyle S_n=a_1\cdot \frac{1-r^{n}}{1-r}S
n

=a
1

⋅
1−r
1−r
n

to evaluate the following sum.
\displaystyle \sum_{k=1}^{7}\left(-10 \left(3\right)^{k}\right)
k=1
∑
7

(−10(3)
k
)

$Use the formula displaystyle Sna1cdot frac1rn1rS n a 1 1r 1r n to evaluate the following sum displaystyle sumk17left10 left3rightkright k1 7 103 k class=$

Answer :

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Use the formula \displaystyle S_n=a_1\cdot \frac{1-r^{n}}{1-r}S n ​ =a 1 ​ ⋅ 1−r 1−r n ​ ​ to evaluate the following sum. \displaystyle \sum_{k=1}^{7}\left(-10 \left(3\right)^{k}\right) k=1 ∑ 7 ​ (−10(3) k )

Answer :

Other Questions

Use the formula \displaystyle S_n=a_1\cdot \frac{1-r^{n}}{1-r}S
n

=a
1

⋅
1−r
1−r
n

to evaluate the following sum.
\displaystyle \sum_{k=1}^{7}\left(-10 \left(3\right)^{k}\right)
k=1
∑
7

(−10(3)
k
)