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UnderOath1617
Lv 4
Geometric Sequence?
Been looking at this problem and have no clue how to do it because of the combination of both plus and minus signs but here it is...
Simplify m(cubed) - m(to the 5th power) + m(to the 7th power) - m(to the 9th power) + m(to the 11th power) - ... - m(to the 25th power), if m is an integer.
Thanks!
1 Answer
Relevance
- J ZLv 41 decade agoFavourite answer
r = -m^2. It's as simple as that.
n0 = m^3, n11=-m^25. Now you can use the summation formula to get it.
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