Diketahui g(x)=5x-1 dan (gof)=10x+19 maka f(x ) = ..

g(x) = 5x - 1
(gof)(x) = 

maka
gof(x) = 10x + 19
g(f(x)) = 10x + 19
5f(x) - 1 = 10x + 19
5f(x) = 10x + 19 + 1
5f(x) = 10x + 20
f(x) = 10x/5 + 20/5
f(x) = 2x + 4

Jawabannya:
gof(x)=10x+19
9(f(x))=10x+19
5f(x)-1=10x+19
5f(x)=10x+19+1
5f(x)=10x+20
f(x)=10 x/5 + 20/5
f(x)= 2x+4

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