Question

dada a funçao f definida por f(x)=x2+2x,determine o valor de f(2)+f(1).

Answer 1

F(2) =2*2+2*2
F(2) = 4+4
F(2) = 8

F(1) = 1*2+1*2
F(1) = 2+2
F(1) = 4

F(2)+F(1)=8+4
F(2)+F(1)=12

Answer 2

f(x)= x^2 + 2x 

f(2) = 2^2+ 2.2 
 f(2) = 4 + 4 =8

f(1) = 1^2 + 2.1 

f(1)= 1 + 2 = 3

f(2)+ f(1) = 8 + 3=11