PRECALCULUS A CONCISE COURSE 2ND EDITION PDF

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When I read the first sentence in the book, which states that "a real number is any number that can be written as a decimal", my heart sank. The language usage is as poor as the accuracy of the statement, and it did not bode well for what the rest of the book may offer.

It then proceeds to explain that the set of real numbers contains several important subsets, and calls out the natural numbers, whole numbers and the integers out in 3 clearly separated paragraphs. But this is followed by a discussion on the use of brackets, before the rational numbers and later, the irrational numbers are described - you have to read the text carefully before it is clear that these are two more subsets of the real numbers.

Clearly marked paragraphs for these subsets would have worked better. A good example of this is the formulas given in Chapter 3, pp. These are presented as examples of exponential functions, but in doing so the mathematics is reduced to a subject more akin to the learning of facts rather than learning the art of deduction.

It would have been better to present the section on finance after the section on geometric series, since you need that to explain the formulas. Indeed, the book admits to this "loose end" in Chapter 9, where it belatedly derives one of these formulas, i. The text is well illustrated, with attractive and colourful tables, graphs and pictures. But the content should be better organized with more attention to rigour, thus I would not recommend this book. One typical feature that is extremely disturbing is the fact that the authors decided to throw in mathematical terms without defining them first.

For instance, as early as Chapter 1. There is much more to limits than just "plotting the graph, seeing where the curve goes". The purpose of PreCalc as suggested by its name is to prepare the students to take Calculus. And if we do not want to cover some concepts correctly algebraically and graphically - the motto of this text! Do it in Calculus! The only reason I ever used this is because someone else chose it for our multiple sections course!

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