Question

f(x)=2x +3 qual eo valor de: a)f(-5)= b)f(0)= , c) f(12) ,d) f(x)=21​

Answer 1

a)

F(-5)= 2.(-5)+3

F(-5)= -10 +3

F(-5)= -7

R= (-10;-7)

b)

F(0)= 2.0+3

F(0)= 0+3

F(0)= 3

R=(0;3)

c)

F(12)= 2.12+3

F(12)= 24+3

F(12)=27

R= (12;27)

d)

2.X+ 3= 21

2X= 21-3

  X= 18/2

X= 9

R=( 9;21)