Question

Seja a função de Z em Z definida por f(x)=3x-2. Calcule:

a)f(2)
b) f(-3)
c)f(0)
d) f(3_)
       2

Answer 1

$f(x)=3x-2$

a) $f(2)=3\cdot2-2=6-2=4$

b) $f(-3)=3\cdot(-3)-2=-9-2=-11$

c) $f(0)=3\cdot0-2=-2$

d) $f(\frac{3}{2})=3\cdot\dfrac{3}{2}-2=\dfrac{9}{2}-2=\dfrac{9-4}{2}=\dfrac{7}{2}$