Respuesta :

gmany

[tex]f(x)=9x+1\\\\\dfrac{f(x+h)-f(h)}{h}\\\\f(x+h)=9(x+h)+1=9x+9h+1\\f(h)=9h+1\\\\\dfrac{f(x+h)-f(h)}{h}=\dfrac{9x+9h+1-(9h+1)}{h}=\dfrac{9x+9h+1-9h-1}{h}=\dfrac{9x}{h}\\\\Answer:\ \boxed{\dfrac{f(x+h)-f(h)}{h}=\dfrac{9x}{h}}[/tex]

good job