spangleralanam
spangleralanam spangleralanam
  • 25-05-2022
  • Mathematics
contestada

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

helppppppppppppppppppp i dont know if its the answer i clicked or not class=

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LammettHash
LammettHash LammettHash
  • 25-05-2022

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

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