I think it should be angle bisector
Don't look at this comment.. I messed up the first time so, yeah.
for all
in [-3, 0], so
is non-decreasing over this interval, and in particular we know right away that its minimum value must occur at
.
From the plot, it's clear that on [-3, 0] we have
. So

for some constant
. Given that
, we find that

so that on [-3, 0] we have

and

Answer:
Its x=6
Step-by-step explanation:
I graphed it on mathaway