## anonymous one year ago Hey so i got the correct answer to my question but I need to know how to solve it because I simply used an online calculator. It the summation of upper limit 7 and lower limit k=3 and then k^2

1. anonymous

So it basically looks like this...$\sum_{k=3}^{7}k^2$

2. anonymous

We can expand the sum as follows: $\sum_{k=3}^{7}k^2=3^2+4^2+5^2+6^2+7^2$

3. anonymous

I figured out how to solve it but if you know the formula that would be great because I did it the long way