Question

sejam f(x)=2x+1 e g(x)=3x+1 Então f(g(3))- g(f(3))e igual a:
a)21
B)20
c)1
d)-1

Answer 1

F(3) = 2(3) + 1 = 7

G(3) = 3(3) + 1 = 10

F(10) - G(7) = 2(10) + 1 - 3(7) - 1 = 20-21 = -1

D