Question

-m^3 +3m-1
if m = - 1/3​

Answer 1

$- {m}^{2} + 3m - 1$

$\tt but$

$m = \frac{ - 1}{3}$

$\implies - {( \frac{ - 1}{3} )}^{2} + 3( \frac{ - 1}{3} ) - 1$

$\implies - \frac{1}{9} - 1 - 1$

$\implies - 2 - \frac{1}{9}$

$\orange{ \boxed{\therefore - {m}^{2} + 3m - 1 = \frac{ - 19}{9} }}$