## LaddiusMaximus 4 years ago determine if this limit exists, if so evaluate it. lim h-->0 (2/(4-h)^2-2/16)/h how do you determine if it exists?

1. anonymous

$\lim_{h\rightarrow 0}\frac{2}{(4-h)^2}-\frac{2}{16}$?

2. anonymous

you actually have to do the subtraction to get $\frac{32-2(4-h)^2}{16(4-h)^2}$ and yes, there is another h in the denominator, we can put it in later

3. anonymous

now multiply out in the numerator and get $\frac{32-2(16-8h+h^2)}{16(4-h)^2}$ $\frac{32-32+16h-2h^2}{16(4-h)^2}$ $\frac{8h-h^2}{8(4-h)^2}$ now lets divide by h and get $\frac{8-h}{8(4-h)^2}$and finally replace h by zero to get your answer

4. anonymous

you get $\frac{8-0}{8(4-0)^2}=\frac{8}{8\times 16}=\frac{1}{16}$

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