Question

1) Dada a função f: R+R por f(x) = x2 + 2x, o valor de f(2) é:
(A) 2
(B) 4
(C) 6
(D) 8​

Answer 1

Resposta:

f(x)= x2 + 2x

f(2)= (2).2+2.(2)

f(2)= 4 + 4

f(2)= 8

letra (d)