Question

find k if x+3 is a factor of 3xsq+kx+6

Answer 1

x + 3 is factor
then ,

x = - 3 will b the roots of the equation.

3x² + kx + 6 = 0

3 ( - 3 )² - 3k + 6 = 0

27 - 3k + 6 = 0

33 = 3k

11 = k