If $f ( x ) = 2 x ^ { 2 } + x$ and $g ( x ) = 3 x - 1$ , find $f + g$ , $f - g$ , and their domains.

Name: If $f ( x ) = 2 x ^ { 2 } + x$ and $g ( x ) = 3 x - 1$ , find $f + g$ , $f - g$ , and their domains.
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The Answer of If $f ( x ) = 2 x ^ { 2 } + x$ and $g ( x ) = 3 x - 1$ , find $f + g$ , $f - g$ , and their domains.

If f(x)=2x2+xf ( x ) = 2 x ^ { 2 } + xf(x)=2x2+x

If $f ( x ) = 2 x ^ { 2 } + x$