Evaluate the following limits. If needed, enter oo for ∞\displaystyle \infty and -oo for −∞\displaystyle -\infty.

(a)lim⁡x→∞(−20x2−38x3)=\displaystyle \lim_{{{x}\rightarrow\infty}}{\left(-{20}{x}^{{2}}-{38}{x}^{{3}}\right)}=  

(b)lim⁡x→−∞(−20x2−38x3)=\displaystyle \lim_{{{x}\rightarrow-\infty}}{\left(-{20}{x}^{{2}}-{38}{x}^{{3}}\right)}=  

License