Evaluate the Given Limit, this doesn't look complicated but I'm Stuck anyways how can i finish this 2 problems?

/ means over the other function

-> is an arrow as x approaches....

**Lim x^2 - 16 / over sqr. root of X - 2**

x->4
So far I have:

(X-4) (X+4) / sqr. root of 4 - 2 then i don't know if its right or how to finish it.

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**Lim sqr. root of 3 - t minus sqr. root of 3 / over t**

t->0

I tried to multiply both sides by sqr. root of 3 - t plus sqr. root of 3

then i got

sqr. root of 3 - t / over sqr. root of 3 - t plus sqr. root of 3

I don't know how to finish or if i even started right.

If you can, can you please show the steps.