The Purplemath Forums

by **confused** on Fri Mar 06, 2009 2:16 am

Simplify the following sums:
1
1+8
1+8+27
1+8+27+64
Add two more lines to the list, and make a conjecture about the sums you obtained.

So i simplified and got:
1
9
36
100
but i dont know what to do with this!!! :confused:

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by **theshadow** on Fri Mar 06, 2009 1:33 pm

1 = 1^3
8 = 2^3
27 = 3^3
64 = 4^3

1 = 1^2
9 = 3^2 (3 = 1 + 2)
36 = 6^2 (6 = 1 + 2 + 3)
100 = 10^2 (10 = 1 + 2 + 3 + 4)

by **confused** on Fri Mar 06, 2009 4:23 pm

so the next 2 numbers would be 5^3,6^3? and th formula would be (1+2+3+4+5)^2,(1+2+3+4+5+6)^2? :roll:

by **theshadow** on Sat Mar 07, 2009 4:00 pm

The Purplemath Forums

simplify the sums, add two more lines, make a conjecture

simplify the sums, add two more lines, make a conjecture

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Re: simplify the sums, add two more lines, make a conjecture

Re: simplify the sums, add two more lines, make a conjecture