In Exercises $23-40,$ find the indicated limit$.$

$23.\underset{x2}{lim}3$

$24.\underset{x-2}{lim}-3$

$25.\underset{x3}{lim}x$

$26.\underset{x-2}{lim}-3x$

$27.\underset{x1}{lim}(1-2x^2)$

$28.\underset{t3}{lim}(4t^2-2t1)$

$29.\underset{x1}{lim}(2x^3-3x^{2}x2)$

$30.\underset{x0}{lim}(4x^5-20x^{2}2x1)$

$31.\underset{s0}{lim}(2s^2-1)(2s4)$

$32.\underset{x2}{lim}(x^{2}1)(x^2-4)$