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

(a)$\displaystyle \lim_{{{x}\rightarrow\infty}}{\left({14}{x}^{{2}}+{26}{x}^{{3}}\right)}=$
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(b)$\displaystyle \lim_{{{x}\rightarrow-\infty}}{\left({14}{x}^{{2}}+{26}{x}^{{3}}\right)}=$
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