Question: Which options represent algebraic expressions? [ begin{aligned} & 2 x^{2}+3 x-1=0 & 5 x+8 & 2 n+3 m & 5 x-7=3 x+1

Which options represent algebraic expressions?

\[ \begin{aligned} & 2 x^{2}+3 x-1=0 \\ & 5 x+8 \\ & 2 n+3 m \\ & 5 x-7=3 x+1 \end{aligned} \]

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