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zhannawk [14.2K]
2 years ago
14

Solve equation by using the quadratic formula. 15x^2 + 13x = 0

Mathematics
1 answer:
MariettaO [177]2 years ago
3 0

Answer:

0 and - 13/15

Step-by-step explanation:

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How many terms are there in a geometric series if the first term is 4, the common ration is 3 and the sum of the series is 160
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\bf \qquad \qquad \textit{sum of a finite geometric sequence}
\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
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81=3^n~~
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explain:

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