Find all zeros of the function f(x)=2(-5x+9)(x+11)(-x+3)?

This looks like a homework question so there would be little point in just giving you the answer because that way you will not have learned anything. If you are struggling with this question, there are some things that you can do.

• Teacher

One of your teacher's jobs is to make sure that you understand what it is that you are being taught so if you are not sure the first thing that you should do is to approach them. This may not be high on your list of things that you want to do but it is the one that will get the best and fastest result.

• After school class

Lots of schools have after school or lunch time revision classes that you can take advantage of. They are not provided for the benefit of the teachers, so if your school has one of these, then it could very well be worth a visit.

If your school doesn't have a revision class or a math club, then maybe it's time that it did, because you can be sure that you are not the only one that could do with some extra help. Perhaps you should suggest it to a teacher and see what happens. You can be sure that you will be credited with showing some initiative.

• Internet

There are some really good revision sites on the Internet that will probably be able to help you with your math problems. They are also an excellent way to revise because they often look at problems and show you how to break them down and tackle them in ways that perhaps your teacher hasn't thought of, and so everything may all become clear.