[tex]f( - 1) = - 3 \times (- 1) + 6 = \\ f( - 1) = 3 + 6 = \\( f - 1) = 9[/tex]
[tex]f(0) = - 3 \times 0 + 6 = \\ f(0) = 6[/tex]
[tex]f( - 1) \times f(0) = 9 \times 6 = 54[/tex]
