Fungsi f(x) = x² -5x . Nilai f (4) - f (-2) = .......

Ini jawaban dan caranya

[tex]f(4) = {4}^{2} - 5(4) \\ = 16 - 20 \\ = - 4[/tex]
[tex]f( - 2) = ( { - 2})^{2} - 5( - 2) \\ = 4 + 10 \\ = 14[/tex]
maka : f (4) - f (-2) =
-4 - 14 = -18