Q. Find the sum of the infinite geometric series.−5−1−51−251+Write your answer as an integer or a fraction in simplest form.______
Identify Terms and Ratio: To find the sum of an infinite geometric series, we need to identify the first term a and the common ratio r of the series. The formula for the sum of an infinite geometric series is S=1−ra, where |r| < 1. In the given series, the first term is −5 and each subsequent term is 51 times the previous term, so the common ratio is −51.
Apply Sum Formula: We can now apply the formula for the sum of an infinite geometric series: S=1−ra. Substituting the values we have, S=1−(−51)−5.
Substitute Values: Now we perform the calculation: S=(−5)/(1+1/5).First, we convert 1 to a fraction with a denominator of 5 to combine it with 1/5: 1=5/5.So, S=(−5)/(5/5+1/5).
Perform Calculation: Next, we add the fractions in the denominator: (55+51)=56. So, S=56−5.
Combine Fractions: To divide by a fraction, we multiply by its reciprocal. Therefore, S=(−5)×(65).
Multiply by Reciprocal: Now we multiply the numerators and the denominators: S=6−5×5.
Final Multiplication: The multiplication gives us: S=−625. This is the sum of the infinite geometric series in simplest fractional form.
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