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25. (xa)(ax 1 ) 26. (a^2  2 a 4 )( 3 a^2  6 a 10 )


26. ( 2 z 3 x 5 )( 10 x 7 z 3 ) 28. ( 3 a 17 b)( 9 a 7 b)


27. (xayy)(axxy) 30. 3 x( 2 x 1 )( 4 x^2  2 x 1 )


28. (ab)^2 (a^4  2 a^3 b 6 a^2 b^2  2 ab^3 b^4 ) 32. (x 2 )(x^2 x 1 )


29. (a 3 )(a^2  3 a 3 ) 34. (ab)( 2 a^2  5 ab 8 b^2 )


30. ( 2 x 3 )( 4 x^2  12 x 21 ) 36. ( 6 )( 36 6 )
    27

(^122)
ab a  abb

37. ( 2 1 )( 4 2 1 )
    8

(^12)
a a  a 38. ̧ ̧
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39. ̧
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a 40. (a 4 )( 19 a^2  13 a 7 )

41. (x 6 )(x 10 ) 42. (x^2  7 x 4 )(x^2  7 x 18 )


42. (x^2  8 x 20 )(x^2  8 x 2 )

Exercise 3⋅ 4

1. ( 6 x 1 )(x 1 ) 2. (a 1 )( 3 a^2  3 a 5 )


2. (xy)(x 3 y)(x 2 y) 4. (x 6 )(x 1 )


3. ( 2 x 3 )(x 1 ) 6. (x 3 )( 3 x 2 )


4. (x 2 )(x 1 )(x 3 ) 8. (x 1 )(x 2 )(x 3 )


5. (a 3 )(a^2  3 a 12 ) 10. (a 1 )(a 1 )(a^2  2 a 3 )


6. (a 1 )(a 4 )(a 2 ) 12. (x 2 )(x^2 x 2 )


7. (ab)(a^2  6 abb^2 ) 14. (x 3 )(x^2  3 x 8 )


8. (xy)(x 3 y)(x 2 y) 16. (x 2 )( 2 x 1 )(x^2  1 )


9. ( 2 x 1 )(x 1 )(x 2 )( 2 x 1 ) 18. x(x 1 )(x^2 x 1 )(x^2 x 1 )


10. ( 4 x 1 )(x^2 x 1 ) 20. ( 2 x 1 )( 3 x 2 )( 3 x 1 )