By Badiale M., Benci V., D'Aprile T.

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A2 3a 11. 2a 6a 1 2a 2 5a 1 4 1 4 ? a2a 10. a 2 2 3a 1 6 2 16 1 5x 12. 6x2222x9 ? 15 4x In 13–24, divide and express each quotient in simplest form. In each case, list any values of the variables for which the fractions are not defined. 9 13. 34 4 20 6 14. 12 a 4 4a 3b 15. 6b 5c 4 10c a2 4 3a 16. 8a 4 2 2 4 4x 92 8 17. x 3x 18. 2 2 6c 1 9 c 2 3 19. c 5c 2 15 4 5 2 2 w 2 4 w 52 1 20. w 5w 12 4 (b 1 3) 21. 4b 1 b 2 1 15 4 (a 1 3) 22. a 1 8a 4a 23. (2x 1 7) 4 2x2 1 15x 2 7 24. pgs 8/12/08 1:47 PM Page 53 Adding and Subtracting Rational Expressions 53 In 25–30, perform the indicated operations and write the result in simplest form.

Pgs 8/12/08 1:46 PM Page 23 Factoring Polynomials 23 Solution Find the common factor of the first two terms and the common factor of the last two terms. Use the sign of the first term of each pair as the sign of the common factor. a3 1 a2 2 2a 2 2 5 a2(a 1 1) 2 2(a 1 1) 5 (a 1 1)(a2 2 2) Answer Note: In the polynomial given in Example 2, the product of the first and last terms is equal to the product of the two middle terms: a3 ؒ (22) 5 a2 ؒ (22a). This relationship will always be true if a polynomial of four terms can be factored into the product of two binomials.

4a4a 2 1 8 2 7x 1 12 24. xx2 2 1 2x 2 15 25. y2 1 4y 1 4 3 2 2 a 1 1 27. a a22 2a 2a 1 1 28. 3xy 2 2a 1 10 22. 3a 1 15 5y2 2 20 3 2 (b 1 1) 4 2 b2 27 1 7a 26. 21a 2 2 21 4 2 2(x 2 1) 29. x2 2 6x 1 9 30. 5(1 2 b) 1 15 b2 2 16 2-3 MULTIPLYING AND DIVIDING RATIONAL EXPRESSIONS Multiplying Rational Expressions 8 We know that 23 3 45 5 15 and that 34 3 32 5 98. In general, the product of two ac rational numbers ba and dc is ba ? dc 5 bd for b 0 and d 0. This same rule holds for the product of two rational expressions: ᭤ The product of two rational expressions is a fraction whose numerator is the product of the given numerators and whose denominator is the product of the given denominators.

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Semiclassical limit for a quasilinear elliptic field equation one-peak and multipeak solutions by Badiale M., Benci V., D'Aprile T.


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