Find the intervals on which the function 
is
(a) strictly increasing (b) strictly decreasing.
f(x)=6-9x-x2
f’(x)=-(2x+9)
We can see that f(x) is increasing for 
and decreasing in 
1
Find the intervals on which the function is
(a) strictly increasing (b) strictly decreasing.
f(x)=6-9x-x2
f’(x)=-(2x+9)
We can see that f(x) is increasing for and decreasing in