29.06.2016 Views

Thomas Calculus 13th [Solutions]

  • No tags were found...

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

94 Chapter 2 Limits and Continuity<br />

26.<br />

2<br />

lim x 5 x<br />

3<br />

x x x 2<br />

lim<br />

x<br />

1<br />

1 5<br />

x<br />

x<br />

2<br />

1 2<br />

x<br />

2<br />

x<br />

3<br />

1<br />

5<br />

2<br />

lim x x<br />

x 1<br />

1 2<br />

x<br />

2<br />

x<br />

3<br />

0 0<br />

1 0 0<br />

0 0<br />

27.<br />

2 1<br />

1<br />

x<br />

1/2<br />

x<br />

2<br />

7<br />

x<br />

x<br />

2 x x<br />

lim lim 0<br />

x<br />

3x<br />

7 3<br />

28.<br />

2<br />

x<br />

1/2<br />

1<br />

2 x<br />

lim lim 1<br />

x 2 x x<br />

1<br />

2<br />

x<br />

1/2<br />

29.<br />

3 5<br />

lim x x<br />

3 5<br />

x x x<br />

1<br />

1<br />

(1/5) (1/3)<br />

x<br />

2 /15<br />

(1/5) (1/3)<br />

x<br />

1<br />

x<br />

2 /15<br />

lim 1 x lim 1<br />

x 1 x<br />

1<br />

30.<br />

31.<br />

1<br />

1 4<br />

x<br />

2<br />

lim x x<br />

x<br />

lim<br />

x x<br />

2 3<br />

1<br />

1<br />

x x x<br />

1/15 1 7<br />

5/3 1/3<br />

2x<br />

19/15 8/5<br />

lim 2x<br />

x 7 lim x x<br />

x x x x<br />

8/5 3 1<br />

3 x 1<br />

x<br />

3/5<br />

x<br />

11/10<br />

32.<br />

lim<br />

x<br />

1 3<br />

3<br />

5<br />

x x<br />

x<br />

2/3 x<br />

lim<br />

2/3<br />

2<br />

1 4<br />

x x x<br />

x<br />

1/3 x<br />

5 3 5<br />

2 4<br />

2<br />

33.<br />

lim<br />

x<br />

x x<br />

2 1<br />

1<br />

2 2<br />

1/<br />

lim x x<br />

2<br />

x ( x 1)/ x<br />

2 2<br />

lim ( x 1)/ x<br />

x<br />

( x 1)/ x<br />

2<br />

lim 1 1/ x 1 0<br />

(1 1/ x) (1 0)<br />

1<br />

x<br />

34.<br />

2 2 2<br />

x 1 x 1/ x<br />

lim lim<br />

1<br />

2<br />

x<br />

x<br />

x ( x 1)/ x<br />

lim<br />

x<br />

2 2<br />

( x 1)/ x<br />

( x 1)/( x)<br />

2<br />

lim 1 1/ x 1 0<br />

( 1 1/ x) ( 1 0)<br />

1<br />

x<br />

35.<br />

lim<br />

x<br />

x 3<br />

2<br />

4x<br />

25<br />

( x 3)/ x<br />

lim<br />

x 4x 25/ x<br />

2<br />

2 2<br />

lim<br />

( x 3)/ x<br />

x (4x 25)/ x<br />

2 2<br />

lim<br />

x<br />

(1 3/ x) (1 0) 1<br />

2<br />

4 25/ x 4 0 2<br />

36.<br />

lim<br />

x<br />

6<br />

3<br />

4 3x<br />

x<br />

9<br />

3 6<br />

(4 3 x )/ x<br />

lim<br />

6 6<br />

x x 9/ x<br />

3 3<br />

(4 3 x )/( x )<br />

lim<br />

6 6<br />

x ( x 9)/ x<br />

3<br />

lim ( 4/ x 3) (0 3)<br />

3<br />

6<br />

x 1 9/ x 1 0<br />

37.<br />

lim<br />

x 0<br />

1<br />

positive<br />

3 x<br />

positive<br />

38.<br />

lim<br />

x 0<br />

5<br />

positive<br />

2 x<br />

negative<br />

39.<br />

lim<br />

x 2<br />

3<br />

positive<br />

x 2 negative<br />

40.<br />

1<br />

positive<br />

lim x 3 positive<br />

x 3<br />

41.<br />

lim<br />

x 8<br />

2x<br />

negative<br />

x 8 positive<br />

42.<br />

lim<br />

x 5<br />

3x<br />

negative<br />

2x<br />

10 negative<br />

43. lim 4<br />

2<br />

x 7 ( x 7)<br />

positive<br />

positive<br />

44. lim 1<br />

2<br />

x 0 x ( x 1)<br />

negative<br />

positive positive<br />

45. (a) 2<br />

1/3<br />

xlim<br />

0 3 x<br />

(b) 2<br />

1/3<br />

xlim<br />

0 3 x<br />

Copyright<br />

2014 Pearson Education, Inc.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!