mohon bantuannya.. ( beserta rumusnya )

[tex]f(x) = {x}^{3} + 2 {x}^{2} - 3x \\ {f}^{ 1} (x) = 3 {x}^{2} + 4x - 3 \\ \\ maka \\ {f}^{1} ( - 2) = 3 ({ - 2})^{2} + 4( - 2) - 3 \\ {f}^{ 1} ( - 2) = 12 - 8 - 3 \\ = 1[/tex]