Problem 42 of 7
Interpret the finite geometric series written in sigma notation: sum from m=0 to 3 of 2(-4)^m.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
interpret index, first term, ratio, and bounds.
Hidden until you reveal it.
Interpret index bounds, first term, ratio, and number of terms.
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Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Substitute the lower index to find the first term.
2. Identify the multiplier caused by increasing the index by 1.
3. Compute the number of included index values.
4. Set up or evaluate the finite sum.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using the upper bound alone as term count when the lower bound is not 1.