$\lim_{x\rightarrow11}\frac{x^2-121}{x-11}=$   (a)  

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 $\lim_{x\rightarrow16}\frac{x^2-256}{x-16}=$   (a)  

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 $\lim_{x\rightarrow9}\frac{x^2-81}{x-9}=$   (a)  

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 $\lim_{x\rightarrow18}\frac{x^2-324}{x-18}=$   (a)  

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 $\lim_{x\rightarrow5}\frac{x^2+3x-40}{x-5}=$   (a)  

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 $\lim_{x\rightarrow12}\frac{x^2-20x+96}{x-12}=$   (a)  

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 $\lim_{x\rightarrow17}\frac{x^2-3x-238}{x-17}=$   (a)  

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 $\lim_{x\rightarrow7}\frac{x^2-14x+49}{x-7}=$   (a)    
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 $\lim_{x\rightarrow6}\frac{2x^2-3x-54}{x-6}=$   (a)  
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