Bonjour !
a)
[tex]f(2) = 8 \times 2 = 16[/tex]
[tex]f( - 3) = - 3 \times 8 = - 24[/tex]
[tex]f(0) = 8 \times 0 = 0[/tex]
b)
[tex]f( - 5) = - 5 \times 8 = - 40[/tex]
[tex]f( \frac{1}{8} ) = \frac{1}{8} \times 8 = 1[/tex]
c)
[tex]f(x) = - 16 \\ \iff 8x = - 16\\ \iff x = - \frac{16}{8} = - 2[/tex]
[tex]f(x) = 0\\ \iff 8x = 0\\ \iff x = 0[/tex]
[tex]f(x) = 28\\ \iff 8x = 28\\ \iff x = \frac{28}{8} = \frac{7}{2} [/tex]
Bonne journée
