Helppppppppppppppppppp i dont know if its the answer i clicked or not

asked Mar 7, 2023 108k views

20 votes

Helppppppppppppppppppp
i dont know if its the answer i clicked or not

by Bellu

7.2k points

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5 votes

Regrouping terms in the sum as

x + (-5x + 5x) + (-9x + 9x) + … + (-21x + 21x) - 25x

you can see that all the middle terms cancel and you're left with

x - 25x = -24x

Ben Sharpe answered Mar 11, 2023

6.8k points

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