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Page 1
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Exercise 2 1 .1
Question 1:
Evaluate the Given limit:
x3
lim 3 x
?
?
Solution 1:
x3
lim 3 x
?
? = 3 + 3 = 6
Question 2:
Evaluate the Given limit:
x
22
lim
7
x
? ?
??
?
??
??
Solution 2:
x
22
lim
7
x
? ?
??
?
??
??
=
22
7
?
??
?
??
??
Question 3:
Evaluate the Given limit :
2
x1
lim r ?
?
Solution 3:
2
x1
lim r ?
?
= ? ?
2
1 ?? ?
Question 4:
Evaluate the Given limit:
x1
43
lim
2
x
x
?
?
?
Solution 4:
x1
43
lim
2
x
x
?
?
?
=
? ? 4 4 3
16 3 19
4 2 2 2
?
?
??
?
Page 2
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Exercise 2 1 .1
Question 1:
Evaluate the Given limit:
x3
lim 3 x
?
?
Solution 1:
x3
lim 3 x
?
? = 3 + 3 = 6
Question 2:
Evaluate the Given limit:
x
22
lim
7
x
? ?
??
?
??
??
Solution 2:
x
22
lim
7
x
? ?
??
?
??
??
=
22
7
?
??
?
??
??
Question 3:
Evaluate the Given limit :
2
x1
lim r ?
?
Solution 3:
2
x1
lim r ?
?
= ? ?
2
1 ?? ?
Question 4:
Evaluate the Given limit:
x1
43
lim
2
x
x
?
?
?
Solution 4:
x1
43
lim
2
x
x
?
?
?
=
? ? 4 4 3
16 3 19
4 2 2 2
?
?
??
?
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Question 5:
Evaluate the Given limit:
10 5
1
1
lim
1
x
xx
x
??
??
?
Solution 5:
? ? ? ?
10 5
10 5
1
1 1 1
1 1 1 1 1
lim
1 1 1 2 2
x
xx
x
??
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
Question 6:
Evaluate the Given limit:
? ?
5
0
11
lim
x
x
x
?
??
Solution 6:
? ?
5
0
11
lim
x
x
x
?
??
Put x + 1 = y so that y → 1 as x → 0.
Accordingly,
? ?
5
0
11
lim
x
x
x
?
??
=
5
1
1
lim
1
x
y
y
?
?
?
? ?
55
1
5 1 1
5
0
1
lim
1
5.1 lim
5
11
lim 5
x
nn
n
xa
x
y
y
xa
na
xa
x
x
?
??
?
?
?
?
?
?? ?
??
??
?
??
?
??
??
Question 7:
Evaluate the Given limit:
2
2
2
3 10
lim
4
x
xx
x
?
??
?
Solution 7:
At x = 2, the value of the given rational function takes the form
0
0
.
?
2
2
2
3 10
lim
4
x
xx
x
?
??
?
=
? ? ? ?
? ? ? ?
2
2 3 5
lim
22
x
xx
xx
?
??
?
??
Page 3
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Exercise 2 1 .1
Question 1:
Evaluate the Given limit:
x3
lim 3 x
?
?
Solution 1:
x3
lim 3 x
?
? = 3 + 3 = 6
Question 2:
Evaluate the Given limit:
x
22
lim
7
x
? ?
??
?
??
??
Solution 2:
x
22
lim
7
x
? ?
??
?
??
??
=
22
7
?
??
?
??
??
Question 3:
Evaluate the Given limit :
2
x1
lim r ?
?
Solution 3:
2
x1
lim r ?
?
= ? ?
2
1 ?? ?
Question 4:
Evaluate the Given limit:
x1
43
lim
2
x
x
?
?
?
Solution 4:
x1
43
lim
2
x
x
?
?
?
=
? ? 4 4 3
16 3 19
4 2 2 2
?
?
??
?
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Question 5:
Evaluate the Given limit:
10 5
1
1
lim
1
x
xx
x
??
??
?
Solution 5:
? ? ? ?
10 5
10 5
1
1 1 1
1 1 1 1 1
lim
1 1 1 2 2
x
xx
x
??
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
Question 6:
Evaluate the Given limit:
? ?
5
0
11
lim
x
x
x
?
??
Solution 6:
? ?
5
0
11
lim
x
x
x
?
??
Put x + 1 = y so that y → 1 as x → 0.
Accordingly,
? ?
5
0
11
lim
x
x
x
?
??
=
5
1
1
lim
1
x
y
y
?
?
?
? ?
55
1
5 1 1
5
0
1
lim
1
5.1 lim
5
11
lim 5
x
nn
n
xa
x
y
y
xa
na
xa
x
x
?
??
?
?
?
?
?
?? ?
??
??
?
??
?
??
??
Question 7:
Evaluate the Given limit:
2
2
2
3 10
lim
4
x
xx
x
?
??
?
Solution 7:
At x = 2, the value of the given rational function takes the form
0
0
.
?
2
2
2
3 10
lim
4
x
xx
x
?
??
?
=
? ? ? ?
? ? ? ?
2
2 3 5
lim
22
x
xx
xx
?
??
?
??
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
? ?
2
35
lim
2
3 2 5
22
11
4
x
x
x
?
?
?
?
?
?
?
?
Question 8:
Evaluate the Given limit:
4
2
3
81
lim
2 5 3
x
x
xx
?
?
??
Solution 8:
At x = 2, the value of the given rational function takes the form
0
0
.
? ? ? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ?
2
4
2
33
2
3
2
3 3 9
81
lim lim
2 5 3 3 2 1
39
lim
21
3 3 3 9
2 3 1
6 18
7
108
7
xx
x
x x x
x
x x x x
xx
x
??
?
? ? ?
?
??
? ? ? ?
??
?
?
? ? ?
?
?
?
?
?
Question 9:
Evaluate the Given limit:
0
lim
1
x
ax b
cx
?
?
?
Solution 9:
0
lim
1
x
ax b
cx
?
?
?
=
? ?
? ?
0
01
ab
b
c
?
?
?
Page 4
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Exercise 2 1 .1
Question 1:
Evaluate the Given limit:
x3
lim 3 x
?
?
Solution 1:
x3
lim 3 x
?
? = 3 + 3 = 6
Question 2:
Evaluate the Given limit:
x
22
lim
7
x
? ?
??
?
??
??
Solution 2:
x
22
lim
7
x
? ?
??
?
??
??
=
22
7
?
??
?
??
??
Question 3:
Evaluate the Given limit :
2
x1
lim r ?
?
Solution 3:
2
x1
lim r ?
?
= ? ?
2
1 ?? ?
Question 4:
Evaluate the Given limit:
x1
43
lim
2
x
x
?
?
?
Solution 4:
x1
43
lim
2
x
x
?
?
?
=
? ? 4 4 3
16 3 19
4 2 2 2
?
?
??
?
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Question 5:
Evaluate the Given limit:
10 5
1
1
lim
1
x
xx
x
??
??
?
Solution 5:
? ? ? ?
10 5
10 5
1
1 1 1
1 1 1 1 1
lim
1 1 1 2 2
x
xx
x
??
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
Question 6:
Evaluate the Given limit:
? ?
5
0
11
lim
x
x
x
?
??
Solution 6:
? ?
5
0
11
lim
x
x
x
?
??
Put x + 1 = y so that y → 1 as x → 0.
Accordingly,
? ?
5
0
11
lim
x
x
x
?
??
=
5
1
1
lim
1
x
y
y
?
?
?
? ?
55
1
5 1 1
5
0
1
lim
1
5.1 lim
5
11
lim 5
x
nn
n
xa
x
y
y
xa
na
xa
x
x
?
??
?
?
?
?
?
?? ?
??
??
?
??
?
??
??
Question 7:
Evaluate the Given limit:
2
2
2
3 10
lim
4
x
xx
x
?
??
?
Solution 7:
At x = 2, the value of the given rational function takes the form
0
0
.
?
2
2
2
3 10
lim
4
x
xx
x
?
??
?
=
? ? ? ?
? ? ? ?
2
2 3 5
lim
22
x
xx
xx
?
??
?
??
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
? ?
2
35
lim
2
3 2 5
22
11
4
x
x
x
?
?
?
?
?
?
?
?
Question 8:
Evaluate the Given limit:
4
2
3
81
lim
2 5 3
x
x
xx
?
?
??
Solution 8:
At x = 2, the value of the given rational function takes the form
0
0
.
? ? ? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ?
2
4
2
33
2
3
2
3 3 9
81
lim lim
2 5 3 3 2 1
39
lim
21
3 3 3 9
2 3 1
6 18
7
108
7
xx
x
x x x
x
x x x x
xx
x
??
?
? ? ?
?
??
? ? ? ?
??
?
?
? ? ?
?
?
?
?
?
Question 9:
Evaluate the Given limit:
0
lim
1
x
ax b
cx
?
?
?
Solution 9:
0
lim
1
x
ax b
cx
?
?
?
=
? ?
? ?
0
01
ab
b
c
?
?
?
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Question 10:
Evaluate the Given limit:
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
Solution 10:
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
At z = 1, the value of the given function takes the form
0
0
.
Put
1
6
z = x so that z →1 as x → 1.
Accordingly,
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
=
2
1
1
lim
1
x
x
x
?
?
?
2
1
2 1 1
1
lim
1
2.1 lim
2
x
nn
n
xa
x
x
xa
na
xa
?
??
?
?
?
?
?? ?
??
??
?
??
?
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
= 2
Question 11:
Evaluate the Given limit:
? ?
2
2
1
lim
1
x
ax bx c
cx b a
?
??
??
, a + b + c ? 0
Solution 11:
2
2
1
lim
x
ax bx c
cx bx a
?
??
??
=
? ? ? ?
? ? ? ?
2
2
11
11
a b c
c b a
??
??
=
abc
abc
??
??
= 1 [a + b + c ? 0]
Page 5
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Exercise 2 1 .1
Question 1:
Evaluate the Given limit:
x3
lim 3 x
?
?
Solution 1:
x3
lim 3 x
?
? = 3 + 3 = 6
Question 2:
Evaluate the Given limit:
x
22
lim
7
x
? ?
??
?
??
??
Solution 2:
x
22
lim
7
x
? ?
??
?
??
??
=
22
7
?
??
?
??
??
Question 3:
Evaluate the Given limit :
2
x1
lim r ?
?
Solution 3:
2
x1
lim r ?
?
= ? ?
2
1 ?? ?
Question 4:
Evaluate the Given limit:
x1
43
lim
2
x
x
?
?
?
Solution 4:
x1
43
lim
2
x
x
?
?
?
=
? ? 4 4 3
16 3 19
4 2 2 2
?
?
??
?
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Question 5:
Evaluate the Given limit:
10 5
1
1
lim
1
x
xx
x
??
??
?
Solution 5:
? ? ? ?
10 5
10 5
1
1 1 1
1 1 1 1 1
lim
1 1 1 2 2
x
xx
x
??
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
Question 6:
Evaluate the Given limit:
? ?
5
0
11
lim
x
x
x
?
??
Solution 6:
? ?
5
0
11
lim
x
x
x
?
??
Put x + 1 = y so that y → 1 as x → 0.
Accordingly,
? ?
5
0
11
lim
x
x
x
?
??
=
5
1
1
lim
1
x
y
y
?
?
?
? ?
55
1
5 1 1
5
0
1
lim
1
5.1 lim
5
11
lim 5
x
nn
n
xa
x
y
y
xa
na
xa
x
x
?
??
?
?
?
?
?
?? ?
??
??
?
??
?
??
??
Question 7:
Evaluate the Given limit:
2
2
2
3 10
lim
4
x
xx
x
?
??
?
Solution 7:
At x = 2, the value of the given rational function takes the form
0
0
.
?
2
2
2
3 10
lim
4
x
xx
x
?
??
?
=
? ? ? ?
? ? ? ?
2
2 3 5
lim
22
x
xx
xx
?
??
?
??
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
? ?
2
35
lim
2
3 2 5
22
11
4
x
x
x
?
?
?
?
?
?
?
?
Question 8:
Evaluate the Given limit:
4
2
3
81
lim
2 5 3
x
x
xx
?
?
??
Solution 8:
At x = 2, the value of the given rational function takes the form
0
0
.
? ? ? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ?
2
4
2
33
2
3
2
3 3 9
81
lim lim
2 5 3 3 2 1
39
lim
21
3 3 3 9
2 3 1
6 18
7
108
7
xx
x
x x x
x
x x x x
xx
x
??
?
? ? ?
?
??
? ? ? ?
??
?
?
? ? ?
?
?
?
?
?
Question 9:
Evaluate the Given limit:
0
lim
1
x
ax b
cx
?
?
?
Solution 9:
0
lim
1
x
ax b
cx
?
?
?
=
? ?
? ?
0
01
ab
b
c
?
?
?
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Question 10:
Evaluate the Given limit:
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
Solution 10:
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
At z = 1, the value of the given function takes the form
0
0
.
Put
1
6
z = x so that z →1 as x → 1.
Accordingly,
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
=
2
1
1
lim
1
x
x
x
?
?
?
2
1
2 1 1
1
lim
1
2.1 lim
2
x
nn
n
xa
x
x
xa
na
xa
?
??
?
?
?
?
?? ?
??
??
?
??
?
1
3
1
1
6
1
lim
1
z
z
z
?
?
?
= 2
Question 11:
Evaluate the Given limit:
? ?
2
2
1
lim
1
x
ax bx c
cx b a
?
??
??
, a + b + c ? 0
Solution 11:
2
2
1
lim
x
ax bx c
cx bx a
?
??
??
=
? ? ? ?
? ? ? ?
2
2
11
11
a b c
c b a
??
??
=
abc
abc
??
??
= 1 [a + b + c ? 0]
Chapter 2 1 – Limits and Derivatives Maths
______________________________________________________________________________
Question 12:
Evaluate the Given limit:
2
11
2
lim
2
x
x
x
??
?
?
Solution 12:
2
11
2
lim
2
x
x
x
??
?
?
At x = –2, the value of the given function takes the form
0
0
Now,
2
11
2
lim
2
x
x
x
??
?
?
=
2
2
2
lim
2
x
x
x
x
??
? ??
??
??
?
=
2
1
lim
2
x
x
??
? ?
11
2 2 4
?
??
?
Question 13:
Evaluate the Given limit:
0
sin
lim
x
ax
bx
?
Solution 13:
0
sin
lim
x
ax
bx
?
At x = 0, the value of the given function takes the form
0
0
.
Now,
0
sin
lim
x
ax
bx
?
=
0
sin
lim
x
ax ax
ax bx
?
?
0
sin
lim
x
ax a
ax b
?
??
??
??
??
? ?
0
sin
lim 0 0
ax
a ax
x ax
b ax
?
??
? ? ? ?
??
??
0
sin
1 lim 1
y
ay
by
a
b
?
??
? ? ?
??
??
?
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