Question: given that f(x) = x^2-8 and g(x) = 15-x, find (f-g) (-5), if it exists

 given that f(x) = x^2-8 and g(x) = 15-x, find (f-g) (-5), 

given that f(x) = x^2-8 and g(x) = 15-x, find (f-g) (-5), if it exists

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