Question 325034
I think you mean like this,
{{{sum(n^2+3n,n=2,5)}}}
The summation of that term {{{n^2+3n}}} from n=2 to n=5.
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{{{sum(n^2+3n,n=2,5)=(2^2+3(2))+(3^2+3(3))+(4^2+3(4))+(5^2+3(5)) }}}
{{{sum(n^2+3n,n=2,5)=4+6+9+9+16+12+25+15 }}}
{{{sum(n^2+3n,n=2,5)=96 }}}