Q. Find the sum of the infinite geometric series.−7−27−47−87+Write your answer as an integer or a fraction in simplest form.__
Identify first term and ratio: Identify the first term (a1) and the common ratio (r) of the geometric series.a1=−7 (the first term)To find the common ratio, divide the second term by the first term:r=first termsecond term=−7−7/2=21
Apply sum formula: Apply the formula for the sum of an infinite geometric series, which is S=1−ra1, where S is the sum, a1 is the first term, and r is the common ratio.Here, a1=−7 and r=21.Calculate the sum:S=1−21−7
Simplify denominator and solve: Simplify the denominator and solve for S:S=−(21)7S=−7×(12)S=−14
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