Question

Find the value of m if (x+3) is a factor of 3x +mx +6

Answer 1

x+3=0

x=-3

now put into

3x+mx +6=0

=3×-3+m×-3+6=0

=-9-3m+6=0

=-3=3m

=m=-1

Answer 2

Answer:

Step-by-step explanation:

x+3=0 or x=-3

If x+3 is a factor of f(x)= 3x+mx+3 then

f(-3)=0

3(-3)-3m+3=0

-3m=-3+9=6

m=-6/3=-2