Recent content by rekrul

Yes, solve. And find out the critical points. And if you could explian what a critical point is, that would be great too. I read the wikipedia article about critical points and didn't understand a thing.

Yes, last time I studied math before this was years ago, in high school, and I forgot all of it. I even had to repeat basic things like positive and negative numbers and exponents and fractions.

Thank you for correcting me, it's how I wrote it in class when the teacher was speaking, I had no idea they are not equal.

Thank you iRaid, that is exactly what i needed to know. Next, I don't understand this: if I have f(x,y)=3xy-x^3-y^3 first I want to know how do you solve f(x)= then f(y)= then how do you find out the critical points. I'm sorry if this is stupid, but I have the solved exercise in front of me...

f(x)=5x^3+6x^2-3x+lnx (lnx)`=1/x f(x)=2x^4+3x^2+ cosx (cosx)`=-sinxI know that if I only have x, like 3x, then x disappears (correct me if I'm wrong). So what happens with lnx if x disappears? Same thing with cosx. The lesson is extreme values of functions and i saw critical points mentioned...