ANYOND=E KNOW HOW TO SOLVE THIS??

if the nth term of a sequence is 2n+4 what is the sum of the first n terms

Question

ANYOND=E KNOW HOW TO SOLVE THIS??

if the nth term of a sequence is 2n+4 what is the sum of the first n terms

anonymous · Answer

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anonymous · Answer

@Somy @warpedkitten @Hero @ganeshie8 @mathmath333 @MathNinja_C

mathmath333 · Answer

$\large \color{black}{\begin{align} \sum_{i=1}^{N}(2n+4)\hspace{.33em}\~\
\implies 2\sum_{i=1}^{N}n+\sum_{i=1}^{N}4\hspace{.33em}\~\
\implies 2\dfrac{(N)(N+1)}{2}+4N\hspace{.33em}\~\
\implies (N^2+N)+4N\hspace{.33em}\~\
\implies N^2+5N\hspace{.33em}\~\
\end{align}}$

anonymous · Answer

so do i put n^2+5n into the calculator @mathmath333

mathmath333 · Answer

in the question formula for the sum of the first n terms of the nth term ( 2n+4)

was asked which is this  $N^2+5N$

anonymous · Answer

so that is the sum ? @mathmath333

mathmath333 · Answer

yes the sum

mathmath333 · Answer

Sum of first N terms

anonymous · Answer

thank you @mathmath333