Let f(x)=x2-6x+666, choose correct statements about f(x)
I) f(x) is increasing for x>3
II) f(x) is increasing for x<3
III) f(x) is decreasing for x<3
IV) f(x) is decreasing for x>3
How to calculate when we get only single stationary(in this case only 3)?
What is difference strictly increasing or strictly decreasing?
