## Thomas' Calculus 13th Edition

$3s^{2} - 4s$
Use derivative formula; $f(x)= x^n \implies f'(x)= n x^{n-1}$ Consider $r(s) = s^{3} -2s^{2} +3$ Take first derivative , we have $r'(s) = 3s^{(3-1)} - 2(2)s^{(2-1)} +0= 3s^{2} - 4s$