By Margaret L. Lial
Is there something extra appealing than an “A” in Algebra? to not the Lial staff! Marge Lial, John Hornsby, and Terry McGinnis write their textbooks and accompanying assets with one target in brain: giving scholars the entire instruments they should be successful. With this revision, the Lial group has additional sophisticated the presentation and routines during the textual content. they give numerous fascinating new assets for college kids that might supply additional support while wanted, whatever the studying surroundings (classroom, lab, hybrid, on-line, etc)–new examine talents actions within the textual content, an improved video software on hand in MyMathLab and at the Video assets on DVD, and extra!
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Extra info for Beginning and Intermediate Algebra (5th Edition)
Sample text
60 points. ) 8. 84. 52. 68 points. ) Concept Check In Exercises 9–14, give a number that satisfies the given condition. 9. 6 10. 9 11. A whole number that is not positive and is less than 1 12. 5 13. An irrational number that is between ͙12 and ͙14 14. A real number that is neither negative nor positive Concept Check In Exercises 15–20, decide whether each statement is true or false. 15. Every natural number is positive. 16. Every whole number is positive. 17. Every integer is a rational number.
There are many pairs of values of x and y for which 2x + y will equal 6. Name two such pairs and describe how you determined them. Find the value for (a) x = 4 and (b) x = 6. See Example 1. 9. x + 7 10. x - 3 11. 4x x + 1 3 14. 5x 2 15. 19. 3x 2 + x 20. 2x + x 2 16. 13. 4x 2 12. 6x x - 2 5 21. 459x 17. 3x - 5 2x 18. 4x - 1 3x 22. 275x Find the value for (a) x = 2 and y = 1 and (b) x = 1 and y = 5. See Example 2. 23. 8x + 3y + 5 27. x + 4 y 24. 4x + 2y + 7 28. y + 8 x 25. 31x + 2y2 26. 212x + y2 y x 29.
6x - 2y (a) 3x + 4y (b) 2y - 9 (c) 4x 2 - y 2 EXAMPLE 2 # Evaluating Expressions Find the value of each expression for x = 5 and y = 3. 2x + 7y (a) (b) # = 2 Follow the rules for order of operations. 5 + 7 Multiply. = 31 Add. x 2 - 2y 2 52 = 5 # = 5 52 Let x = 5 and y = 3. 3 = 10 + 21 9x - 8y 2x - y 9 # 5 - 8 # 3 = 2 # 5 - 3 45 - 24 = 10 - 3 21 = , or 3 7 (c) # We could use parentheses and write 2152 + 7132. - 2 = 25 - 2 # Let x = 5 and y = 3. Multiply. Subtract, and then divide. 32 = 3 # # 3 32 Let x = 5 and y = 3.