rodriguezzlaura rodriguezzlaura
  • 03-08-2017
  • Mathematics
contestada

Someone please help me out!

Someone please help me out class=

Respuesta :

musiclover10045
musiclover10045 musiclover10045
  • 03-08-2017

try it with a couple different numbers

 try 4:  1^2 +2^2 +3^2 +4^2 = 1 +4 +9 +16 =30

 formula: 4(4+1)(2*4+1)/6 = 4*5*9 = 180/6=30

 this one works

now try 5

1^2 + 2^2+3^2+4^2+5^2 = 55

formula: 5(5+1)(2*5+1)/6 = 5*6*11 = 330/6=55

I tried a larger number ( 14) as well and it worked

so you can say that this is true


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