Question

find the value of k so that polynomial x cube + 3 x square - kx minus 3 has one factor as x plus 3

Answer 1

Here is your answer I hope you got that.

Answer 2

if X ➕ 3 is factor So x= -3. By putting value of X in polynomial we get k=-1 because X cube and 3x square are equal but of opposite sing. So they cancel each other and -3k-3=0.
k=3/-3
k=1