Question

sendo f(x)=-2/3x+18, calcule:
a) f(27)=

b) f(-3)=

c) f(0)=

Answer 1

f(x) = $\frac{-2x}{3} + 18$

a) f(27) trocamos o x pelo 27:
$\frac{-2.27}{3} + 18 =\ \textgreater \ -2.9 + 18 =\ \textgreater \ -18 + 18 = 0$

b) f(-3)
$\frac{-2.(-3)}{3} + 18 =\ \textgreater \ -2.(-1) + 18 =\ \textgreater \ 2 + 18 = 20$

c) f(0)
$\frac{-2.0}{3} + 18 =\ \textgreater \ \frac{0}{3} + 18 = 18$