content: I don't know how many times I thought to myself 'I don't remember learning it this way at all'. I have graduated HS about 15 years ago, and need to clept out of the math classes at college. I was recommended this book by my adviser. I became frustrated at how they came to their answers as I found it very complicated. I ended up going on You tube for some more tutorials and saw a much easier way of coming to the solution.