Answer :

f(x)= 2x-1

g(x) = x+4

for (f o g) x on f(x) is replaced by g(x):

(f o g) = 2(x+4)-1

Apply the dsitributive property:

(fo g ) = 2(x)+2(4) -1 = 2x+8 -1 = 2x+7

(f og ) = 2x+7

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