Find the limits

a$)\underset{x}{lim}>-10(2x-10)$

b$)\underset{x}{lim}>2(x^3+5x^2-7x+1)$

c$)\underset{x}{lim}>-1\frac{x}{3x+2}$

d$)\underset{x}{lim}>0\frac{x^3+12x^2-5x}{5x}$

e$)\underset{x}{lim}>9\frac{x^2-81}{x-9}$

f$)\underset{x}{lim}>1\frac{x^2+4x-5}{x^2+3x-4}$

Limits at Infinity: Recall $\underset{x}{lim}>\frac{1}{x}=0$

$5.$

$\underset{x}{lim}\frac{2x^2}{x^2+9}$