Answer:
The value of m is 3
Step-by-step explanation:
we have
[tex]x^{2}+mx+n=0[/tex]
step 1
Find the value of n
For x=0
[tex]0^{2}+m(0)+n=0[/tex]
[tex]n=0[/tex]
step 2
Find the value of m
For x=-3
substitute
[tex]x^{2}+mx=0[/tex]
[tex](-3)^{2}+m(-3)=0[/tex]
[tex]9-3m=0[/tex]
[tex]3m=9[/tex]
[tex]m=3[/tex]
