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f(n) = 3n-1
g(n) = 2n + 4
(fog)(-2), multiply each function, and replace n by -2.
(fog)(-2) = ( 3(-2)-1 ) x (2(-2) + 4)
(fog)(-2)= (-6-1) x (-4+4)
(fog)(-2) = -7 x 0
(fog)(-2)= 0