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3f(x) will have same x value as minium , but the y value will be multiplied by 3

for 3f(x) -> minium ( 3 , 15 ) , methinks , havent taught much about it so might not be right

for f(2x) , one thinks use chain rule

let g(x) = f(2x)
g'(x) = 2 f ' (2x) =0 for min/max.
f ' (2x) =0
gets a bit strange here

Well, there is no need to use the chain rule, I guess.

we know that f' (3) =0 also , but I am not 100% sure if that means 2x =3 , dont think it does

but with the second one, shouldn't it stretch the y axis???
and the first one th x axis???

ok, thanks :)