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It should be 1 and 3 ?? please correct me if I'm wrong.

$f(x) = x^2 - 6x + 666$

$f'(x) = 2x-6$

1) Find critical points, here $3$ is critical point.

2) find sign in the intervals $(-\infty,3),(3, \infty)$

3) take any values say x=1 in $(-\infty,3)$  then $f'(x)$ is -ve

function is decreasing

4) take any values say x=4 in $(3,\infty)$  then $f'(x)$ is +ve

function is increasing.
yes a) and c) both correct
Yes, I think both a and c are correct.

it will be easy by solving through wavey curve  a,c are the correct options

1
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