The functions f and g are given. In function g, r is a constant. If $…

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f (x) = x + 4

g (x) = 3 x^{2} - r x + 48

The functions f and g are given. In function g, r is a constant. If

f (x) \cdot g (x) = 3 x^{3} + 192

, what is the value of r?