We don't know what Math book you're looking at but if you're looking at a problem in a book, then just solve it. Sometimes the answers are in the back of the book. But I think it's better for you to solve this for yourself. Look back in earlier pages and look at the examples or rather read the chapter so you can get a better understanding. If nothing else, try your best and ask about it to your teacher and maybe ask for a tutor if possible