Question

Seja f(x)=3x+2
qual o valor de x para que f(x)=5?
calcule f(2), f(4), f(0), f(1/3).

Answer 1

para f(x)=5, x é:
5=3x+2
-3x=2-5
-3x= -3(-1)
3x=3
x=3/3
x=1

para x=2, f(2) é:
f(2)=3x+2
f(2)=3.2+2
f(2)=6+2
f(x)=8


para x=4, f(4) é:
f(4)=3x+2
f(4)=3.4+2
f(4)=12+2
f(4)=14

para x=0 f(0) é
f(0)=3x+2
f(0)=3.0+2
f(0)=0+2
f(0)=2

para x=1/3, f(1/3)é:
f(1/3)=3x+2
f(1/3)=3.1/3+2
f(1/3)=3/3+2
mmc=3
f(1/3)=3/3+6/3
f(1/3)=9/3
f(1/3)=3

abraços

Answer 2

f(x)=3x+2

qual o valor de x para que f(x)=5?

f(x) = 3x + 2

5 = 3x + 2

5 - 2 = 3x

3 = 3x

3x = 3

x = 3/3

x = 1

calcule f(2), f(4), f(0), f(1/3):

f(x) = 3x + 2

f(2) = 3.2 + 2 = 6 + 2 = 8

f(2) = 8

f(4) = 3.4 + 2 = 12 + 2 = 14

f(4) = 14

f(0) = 3.0 + 2 = 0 + 2 = 2

f(0) = 2

f(1/3) = 3 . 1/3 + 2 = 3/3 + 2 = 1 + 2 = 3

f(1/3) = 3