Question 58678
g(x)=-5xroot2-6x=8
As you have posted this problem you 
are describing a line which has none
of the features you are asked to 
determine.
Please look at your problem again.
It is probably a quadratic function
with an x^2 in it---maybe your "root 2"
is really x^2.
If so, post accordingly.
Cheers,
Stan H.