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

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

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