Question

Dada a função f:R-R por f(x)=x+2x,determine o valor de f(x) + f(3) - f(1)

Answer 1

F ( x ) = x + 2x

F( x ) + F ( 3 ) - F ( 1 ) =

x + 2 x +3.1 +( 3.2 )  - ( 1 + 2)=

x + 2x +3 +6 -3=

x +2x +6