Question

dada a função f por f (x)=3x-9,determine f (1/3)​

Answer 1

f(x)=3×-9

f(1/3)=?

f(1/3)=3x-9

f(1/3)=3×1/3-9

f(1/3)=3/3-9

f(1/3)=1-9

f(1/3)=-8

Answer 2

$f(x) = 3x - 9 \\ x = \frac{1}{3 } \\ \\ f( \frac{1}{3} ) = \frac{3}{3} - 9 \\ f( \frac{1}{3} ) = 1 - 9 \\ f( \frac{1}{3} ) = - 8$