Tolong kerjakan.........

[tex]17. \sqrt{ {x}^{2} + 2x - 6 } - \sqrt{ {x}^{2} - 4x + 4 } \\ \frac{2 + 4}{2} = 3[/tex]
[tex]18. {f}^{.} (x) = lim \: (h - > 0) \frac{f(x + h) - f(x)}{h} \\ f(x + h) = 5(x + h) + 2 = 5x + 5h + 2 \\ \frac{5x + 5h + 2 - (5x + 2)}{h} = \frac{5h}{h} = 5[/tex]