 By Benjawan Poomsan Becker

A simple to exploit Thai language textbook designed for both self-study or lecture room use. Teaches all 4 language abilities talking, listening (when utilized in conjunction with the cassette tapes), studying and writing . bargains transparent, effortless, step by step guide, construction on what has beenpreviously discovered. utilized by many Thai temples in the United States. steered books to be studied in addition to Thai for rookies are Thai for tourists (a useful Thai word e-book) and converse like a Thai sequence through a similar writer.

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Extra resources for Thai for Beginners

Sample text

The term containing x can be found by adding the product of the "inners" and the product of the "outers" : (2x 3)(5x - 2) I �x I + + (x - 1)(2x + 3) - l)(3x + 3) -2x - p(2-3x + 2x2 r oox3x +r +x (x + 1) ( 2 x + 3) 2x2 x -3. (2x 2)(2x -2) (�x +4x22)(2r -2) (2x m4xx - (2x + t)(2-4x -4x +Ox (2x + 2)(2x -2) 4x2 - 4. Thus, (2x 3)(5x - 2) Sum = 10x2 = -4x l lx I Ix - 6. EXAMPLE 4 Multiply. (a) We diagram the process so that you can learn to do these mentally. ) Sum = = Thus, (b) + Once more, we have + ) Sum = Thus, ((2xx+-3)2)(x(3x+ - = PROGRESS CHECK 4 Multiply mentally.

Let's work through this problem: (2x + 3)(5x - 2) = 2x(5x - 2) + 3(5x - 2) (2x)(5x) + 2x( - 2) + 3(5x) + 3( - 2) = l 0x 2 - 4x + 15x 6 = - 53 54 POLYNOMIALS We have stopped just short of the last step because we want to show the relationships between the factors and the products. If we take the product of the first term of each expression (2x + 3)(5 x - 2) 10x2 + we have the term containing x2• Similarly, taking the product of the last term of each expression (2x + 3)(5x - 2) -6 we have the constant term.

A) x < 0 Answers (a) (c) • • (b) x � - I I I + I + I I I -2 - 1 -2 - 1 0 0 2 2 (c) x < - 2 (b) I + I -2 - 1 0 I 2 • 31 32 THE REAL NUMBER SYSTEM We also write double inequalities such as - l ::; x < 2 The solution set to this inequality consists of all real numbers which satisfy - 1 ::; x and x < 2 that is, all numbers between - 1 and 2 and including - 1 itself. We can easily graph the solution set on a real number line. -5 I -4 I -3 + -2 I -1 0 -1 EXAMPLE 6 Graph -3 < x < - 1, 5 x 2 I 3 4 5 I 3 4 I <2 a real number.