Q21 of 292 Page 549

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


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Find the intervals on which the function is

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 20

Find the intervals on which the function is

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 22

Find the intervals on which each of the following functions is (a) increasing (b) decreasing.


 23

Find the intervals on which each of the following functions is (a) increasing (b) decreasing.