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 Find the function fg and its domain if f(x)=x+7 and g(x)=x7\text { Find the function } f \cdot g \text { and its domain if } f ( x ) = \sqrt { x + 7 } \text { and } g ( x ) = \sqrt { x - 7 } \text {. }

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 Find the function fg and its domain if f(x)=x+7 and g(x)=x7\text { Find the function } f \cdot g \text { and its domain if } f ( x ) = \sqrt { x + 7 } \text { and } g ( x ) = \sqrt { x - 7 } \text {. }

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