Question

Seja a função f (x)=2x+3 calcule : a) f (-1) b) f (5) c) f (x)=8

Answer 1

F(x) =2x+3

a) F(-1) = 2.(-1)+3 = -2+3 = 1

b) F(5) = 2.(5)+3 = 10 + 3 = 13

c) 8 = 2x+3

   8-3 = 2x

   5 = 2x

   5/2 = x