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Limits problem , i cant solve

Hey everyone again,

I am having trouble with certain limit problems on my exam revision maths booklet , I have attached the questions and answers.

I assume the steps involved to solve questions 6(b), 8(b), 10(a) are as followed: These questions

step 1: Sub in the limits

step 2: if it equals (0/0) we must factorise

step 3: sub final values of factorise.

I cant get the answer. I think it is basic operations I cant do but I am not entirely sure. Please correct me , where I am wrong.