Question

determine o valor da função afim f(x) = -3x+4 para:
a) x=1; b) x=1/3; c) x=0 d) x= k +1"

Answer 1

f(x) = y

a) - 2x + 3  
    - 2 . 1 + 3
    -2 + 3
       y = 1

b) - 2 . 1/2 + 3 
    - 1 + 3
      y = 2

Answer 2

$f(x) = -3x + 4$

a)
$f(1) = -3.1+4 \\ f(1) = 1$

b)
$f( \frac{1}{3})= -3 (\frac{1}{3})+4 \\ \\ f( \frac{1}{3}) = -1 + 4 \\ \\ f( \frac{1}3}) = 3$

c)
$f(0) = -3.0 + 4 \\ f(0) = 4$

d)
$f(k\!+\!\!1) = -3(k+1) + 4 \\ \\ f(k\!+\!\!1)= -3k - 3 + 4 \\ \\ f(k\!+\!\!1) = -3k+1$