Worksheet: Logarithmic Function









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Worksheet: Logarithmic Function

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216843 Worksheet: Logarithmic Function

Vanier College Sec V Mathematics

Department of Mathematics 201-015-50Worksheet: Logarithmic Function

1. Find the value ofy.

(1) log

525 =y(2) log31 =y(3) log164 =y(4) log218

=y (5) log

51 =y(6) log28 =y(7) log717

=y(8) log319 =y (9) log y32 = 5 (10) log9y=12 (11) log418 =y(12) log9181 =y

2. Evaluate.

(1) log

31 (2) log44 (3) log773(4)blogb3(3) log2553(4) 16log48

3. Write the following expressions in terms of logs ofx,yandz.

(1) logx2y(2) logx3y2z (3) logpx 3py 2z

4(4) logxyz

(5) log xyz (6) logxy 2 (7) log(xy)13 (8) logxpz (9) log 3px 3 pyz (10) log4rx 3y2z

4(11) logxrpx

z (12) logrxy 2z 8

4. Write the following equalities in exponential form.

(1) log

381 = 4 (2) log77 = 1 (3) log12

18 = 3 (4) log31 = 0 (5) log 4164
=3 (6) log6136 =2 (7) logxy=z(8) logmn=12

5. Write the following equalities in logarithmic form.

(1) 8

2= 64 (2) 103= 10000 (3) 42=116

(4) 34=181 (5) 12 5 = 32 (6)13 3 = 27 (7)x2z=y(8)px=y

6. True or False?

(1) log xy 3 = logx3logy(2) log(ab) = logalogb(3) logxk=klogx (4) (loga)(logb) = log(a+b) (5)logalogb= log(ab) (6) (lna)k=klna (7) log aaa=a(8)ln1x = lnx(9) lnpx xk= 2k

7. Solve the following logarithmic equations.

(1) lnx=3 (2) log(3x2) = 2 (3) 2logx= log2 + log(3x4) (4) logx+ log(x1) = log(4x) (5) log

3(x+ 25)log3(x1) = 3 (6) log9(x5) + log9(x+ 3) = 1

(7) logx+ log(x3) = 1 (8) log2(x2) + log2(x+ 1) = 2

8. Prove the following statements.

(1) log pb x= 2logbx(2) log1pb px=logbx(3) logb4x2= logbpx

9. Given that log2 =x, log3 =yand log7 =z, express the following expressions

in terms ofx,y, andz. (1) log12 (2) log200 (3) log 143
(4) log0:3 (5) log1:5 (6) log10:5 (7) log15 (8) log60007

10. Solve the following equations.

(1) 3 x2 = 12 (2) 31x= 2 (3) 4 x= 5x+1(4) 61x= 10x (5) 3

2x+1= 2x2(6)101 +ex= 2

(7) 5

2x5x12 = 0 (8)e2x2ex= 15

11. Draw the graph of each of the following logarithmic functions, and analyze each

of them completely. (1)f(x) = logx(2)f(x) = logx (3)f(x) =log(x3) (4)f(x) =2log3(3x) (5)f(x) =ln(x+ 1) (6)f(x) = 2ln12 (x+ 3) (7)f(x) = ln(2x+ 4) (8)f(x) =2ln(3x+ 6)

12. Find the inverse of each of the following functions.

(1)f(x) = log2(x3)5 (2)f(x) = 3log3(x+ 3) + 1 (3)f(x) =2log2(x1) + 2 (4)f(x) =ln(12x) + 1 (5)f(x) = 2x3 (6)f(x) = 233x1 (7)f(x) =5ex+ 2 (8)f(x) = 12e2x

13. 15 000$ is invested in an account that yeilds 5% interest per year. After how

Vanier College Sec V Mathematics

Department of Mathematics 201-015-50Worksheet: Logarithmic Function

1. Find the value ofy.

(1) log

525 =y(2) log31 =y(3) log164 =y(4) log218

=y (5) log

51 =y(6) log28 =y(7) log717

=y(8) log319 =y (9) log y32 = 5 (10) log9y=12 (11) log418 =y(12) log9181 =y

2. Evaluate.

(1) log

31 (2) log44 (3) log773(4)blogb3(3) log2553(4) 16log48

3. Write the following expressions in terms of logs ofx,yandz.

(1) logx2y(2) logx3y2z (3) logpx 3py 2z

4(4) logxyz

(5) log xyz (6) logxy 2 (7) log(xy)13 (8) logxpz (9) log 3px 3 pyz (10) log4rx 3y2z

4(11) logxrpx

z (12) logrxy 2z 8

4. Write the following equalities in exponential form.

(1) log

381 = 4 (2) log77 = 1 (3) log12

18 = 3 (4) log31 = 0 (5) log 4164
=3 (6) log6136 =2 (7) logxy=z(8) logmn=12

5. Write the following equalities in logarithmic form.

(1) 8

2= 64 (2) 103= 10000 (3) 42=116

(4) 34=181 (5) 12 5 = 32 (6)13 3 = 27 (7)x2z=y(8)px=y

6. True or False?

(1) log xy 3 = logx3logy(2) log(ab) = logalogb(3) logxk=klogx (4) (loga)(logb) = log(a+b) (5)logalogb= log(ab) (6) (lna)k=klna (7) log aaa=a(8)ln1x = lnx(9) lnpx xk= 2k

7. Solve the following logarithmic equations.

(1) lnx=3 (2) log(3x2) = 2 (3) 2logx= log2 + log(3x4) (4) logx+ log(x1) = log(4x) (5) log

3(x+ 25)log3(x1) = 3 (6) log9(x5) + log9(x+ 3) = 1

(7) logx+ log(x3) = 1 (8) log2(x2) + log2(x+ 1) = 2

8. Prove the following statements.

(1) log pb x= 2logbx(2) log1pb px=logbx(3) logb4x2= logbpx

9. Given that log2 =x, log3 =yand log7 =z, express the following expressions

in terms ofx,y, andz. (1) log12 (2) log200 (3) log 143
(4) log0:3 (5) log1:5 (6) log10:5 (7) log15 (8) log60007

10. Solve the following equations.

(1) 3 x2 = 12 (2) 31x= 2 (3) 4 x= 5x+1(4) 61x= 10x (5) 3

2x+1= 2x2(6)101 +ex= 2

(7) 5

2x5x12 = 0 (8)e2x2ex= 15

11. Draw the graph of each of the following logarithmic functions, and analyze each

of them completely. (1)f(x) = logx(2)f(x) = logx (3)f(x) =log(x3) (4)f(x) =2log3(3x) (5)f(x) =ln(x+ 1) (6)f(x) = 2ln12 (x+ 3) (7)f(x) = ln(2x+ 4) (8)f(x) =2ln(3x+ 6)

12. Find the inverse of each of the following functions.

(1)f(x) = log2(x3)5 (2)f(x) = 3log3(x+ 3) + 1 (3)f(x) =2log2(x1) + 2 (4)f(x) =ln(12x) + 1 (5)f(x) = 2x3 (6)f(x) = 233x1 (7)f(x) =5ex+ 2 (8)f(x) = 12e2x

13. 15 000$ is invested in an account that yeilds 5% interest per year. After how


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