$(1$ point$)$

Evaluate the following limits$.$ If needed, enter 'INF' for $$ and $\text{'}-$INF for $-.$

$($a$)$

$\underset{x}{lim}\frac{\sqrt[\phantom{2}]{115x^2}}{64x}=$

$($b$)$

$\underset{x-}{lim}\frac{\sqrt[\phantom{2}]{115x^2}}{64x}=$