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Mathematics 8 Online
OpenStudy (anonymous):

Help please

OpenStudy (anonymous):

I can't get sigma x^2 for the set of 50 numbers

OpenStudy (welshfella):

5500 + 9600

OpenStudy (adrimit):

I have researched this a while ago. there is actually an algorithm that determines this value.\[\sum_{k=m}^{n}k^2=\frac{1}{3}((n+1)^3-m^3)-\frac{1}{2}((n+1)^2-m^2)+\frac{1}{6}((n+1)-m)\] in your case, m=1 and n=50. \[\sum_{k=1}^{50}k^2=\frac{1}{3}(51^3-1^3)-\frac{1}{2}(51^2-1^2)+\frac{1}{6}(51-1)\] \[a=51^3-1^3=(125000+3*2500+3*50+1)-1=132650\] \[b=51^2-1^2=(2500 + 2*50 + 1) -1=2600\] \[c=51-1=50\] \[\frac{1}{3}a-\frac{1}{2}b+\frac{1}{6}c=\frac{265300-7800+50}{6}=\frac{257550}{6}=42925\]

OpenStudy (adrimit):

therefore the answer is 42925. message me for an algorithm for any polynomial

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