add math f4- chapter1
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1 Given function f : x → 3 x2 − 7, find the
Diberi fungsi f : x → 3x2 − 7, cari
(a) image of 9
imej 9
(b) object which has the image 6
objek yang mempunyai imej 68
!3 ma"#s$
[3 marka!
2 %he functions of f and g a"e defined as f : x → 9 x & ' and g : x → , x k *ind
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → 9x & ' $an g : x → , x ( k) *ari
(a) the va+ue of k
ni+ai k
(b) the comosite function f 2
fungsi gubaan f 2
(c) the comosite function gf
fungsi gubaan gf
!- ma"#s$
[ marka!
3 %he functions of f and g a"e defined as f : x → 6 x − 2 and g : x → x2 − 7 *ind the comositefunction of gf and the va+ue of gf (-)
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → 6x − 2 $an g : x → x2 − 7) *ari fungsi
gubaan gf $an ni+ai gf-.)
!- ma"#s$
[ marka!
4 %he functions of f and g a"e defined as f : x → − 7 x and g : x → , x ' *ind the comosite
function of gf and fg
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → 8 − 7x $an g : x → , x ( ') *ari fungsi
gubaan gf $an fg)
!- ma"#s$
[ marka!
5 %he fuctions f and g a"e defined as f : x → x & 2 and g : x → 2 x & -
*ind gf −'( x)
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → x & 2 $an g : x → 2x & )
*ari gf −'-x.)
!3 ma"#s$
[3 marka!
6 Given function f : x → .sin x., /0 1 x 1 36/0 *ind the va+ues of f (70) and f (20)
Diberi fungsi f : x → /sin x/, 01 x 3601) *ari ni+ai f-71. $an f-281.)
!3 ma"#s$
[3 marka!
7 %he functions of f and g a"e defined as f : x → x & and gf : x → x − 6 *ind the function g
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → x & $an gf : x → x − 6) *ari fungsi g)
!3 ma"#s$
[3 marka!
8 iag"am ' "e"esents a function f : x → px2 & 4x &
5aja ' meaki+i fungsi f: x → px2 & 4x & 8)
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Diagram 1
Rajah 1
*ind the
*ari
(a) va+ues of p and 4,
ni+ai p $an 4,
(b) the object which is maed onto itse+f
objek yang meme%akan kepa$a $iri sen$iri)
!- ma"#s$
[ marka!
9 Given the function f : x → . x − '.
Diberi fungsi f : x → /x − '/)
(a) *ind the images of −, / and
*ari imej bagi −, 0 $an 8)
!3 ma"#s$
[3 marka!
10 Given function f : x → tan 3 x, /0 1 x 1 '/0, find the va+ue of
Diberi fungsi f : x → %an 3x, 01 x '801, cari ni+ai
(a) f (6/0)
(b) x when f ( x) 4 '
x apabi+a f-x. ' !3 ma"#s$
[3 marka!
11 %he functions of f and g a"e defined as f : x → x − 7 and g : x → *ind the comosite function of
fg and the va+ue of fg (−3)
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → x − 7 $an g : x → ) *ari fungsi gubaan fg $an
ni+ai fg-−3.)
!3 ma"#s$
[3 marka!
12 Given function f : x → sin x, '/0 1 x 1 36/0, find the va+ue of
Diberi fungsi f : x → sin x, '801 x 3601, cari ni+ai (a) f (27/0)
(b) x when f ( x) 4 −'
x apabi+a f-x. −'
!3 ma"#s$
[3 marka!
13 Given function f : x → cos 2 x, /0 1 x 1 '/0, find the va+ue of
Diberi fungsi f : x → cos 2x, 01 x '801, cari ni+ai
(a) f (9/0)
(b) x when f ( x) 4 '
x apabi+a f-x. ' !3 ma"#s$
[3 marka!
14 %he functions of f and g a"e defined as f : x → x & - and g : x → 7 x − 2 *ind the comosite
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function of gf and fg
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → x & $an g : x → 7x − 2) *ari fungsi gubaan
gf $an fg)
!3 ma"#s$
[3 marka!
15 %he functions of f and g a"e defined as f : x → x − 9 and fg : x → − 7 x *ind the function g
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → x − 9 $an fg : x → − 7x) *ari fungsi g)
!3 ma"#s$[3 marka!
16 %he functions of f and g a"e defined as f : x → − x & 2 and g : x → *ind the comosite function
of gf and the va+ue of gf (')
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → −x & 2 $an g : x → ) *ari fungsi gubaan gf
$an ni+ai gf-'.)
!2 ma"#s$
[2 marka!
17 Given function f : x → − x & , find the
Diberi fungsi f : x → −x & , cari
(a) image of −'
imej −'
(b) object which has the image /
objek yang mempunyai imej 0
!2 ma"#s$
[2 marka!
18 %he functions of f and g a"e defined as f : x → and gf : x → , x / *ind the function g
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → $an gf : x → , x ( 0) *ari fungsi g)
!3 ma"#s$
[3 marka!
19 %he functions of f and g a"e defined as f : x → 7 x & 3 and g : x → x & 2 *ind the comosite
function of gf and the va+ue of gf (')
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → 7x & 3 $an g : x → 8x & 2) *ari fungsi
gubaan gf $an ni+ai gf-'.)
!2 ma"#s$
[2 marka!
20 Given the function f : x → . x2 − .
Diberi fungsi f : x → /x2 − /)
(a) *ind the images of 2, 7 and
*ari imej bagi 2, 7 $an 8)
(b) *ind objects which have the image of -
*ari objek#objek yang mempunyai imej )
!3 ma"#s$
[3 marka!
21 %he fuctions f and g a"e defined as f : x → , x and g : x → − x *ind
"ungsi#fungsi f $an g $i%akrifkan sebagai f : x → , x ( $an g : x → −x) *ari
(a) f −'( x)
!2 ma"#s$
[2 marka!
(b) f −' g ( x)
!2 ma"#s$
[2 marka!
(c) gf −'( x)
!2 ma"#s$
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[2 marka!
Answer:
1 (a) f (9) 4 3(9)2 − 7 4 236
(b) f ( x) 4 6
3 x2 − 7 4 63 x2 4 7
x2 4 2 x 4 , −
2 (a) x − 3 4 / x 4 3
∴k 4 3
(b) f 2 4 f ( f ( x)) 4 f (9 x & ')
4 9(9 x & ') & ' 4 ' x & '/
(c) gf ( x) 4 g ( f ( x)) 4 g (9 x & ')
4
4 , x 2
3 Given f ( x) 4 6 x − 2 and g ( x) 4 x2 − 7
Diberi f-x. 6x − 2 $an g-x. x2 − 7)
gf ( x) 4 g ( f ( x)) 4 g (6 x − 2) 4 (6 x − 2)2 − 7 4 (36 x2 − 2- x & -) − 7 4 36 x2 − 2- x − 3
gf () 4 36(-)2 − 2-(-) − 3 4 -77
4 Given f ( x) 4 − 7 x and g ( x) 4
Diberi f-x. 8 − 7x $an g-x. ) gf ( x) 4 g ( f ( x)) 4 g ( − 7 x) 4
4 , x −7
fg ( x) 4 f ( g ( x)) 4 f
4 − 7 4
4 , x '
5 5et f −'( x) 4 y
o f ( y) 4 x
y & 2 4 x
y 4 x − 2
%he"efo"e f −'( x) 4 x − 2 gf −'( x) 4 g ( f −'( x)) 4 g ( x − 2)
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4 2( x − 2) & - 4 2 x
6 f ( x) 4 .sin x. f (70) 4 .sin 70. 4 /969
f (20) 4 .sin 20. 4 .−sin (36/0 − 20). 4 .−sin 70.
4 /969
7 Given f ( x) 4 x & and gf ( x) 4 x − 6
Diberi f-x. x & $an gf-x. x − 6)
gf ( x) 4 g ( f ( x)) 4 g ( x & )
g ( x & ) 4 x − 65et y 4 x & o, x 4
g( y) 4 − 6 4 y − ''%he"efo"e, g : x → x − ''
8 (a) f ( x) 4 px2
& 4x & f (') 4 ' p(')2 & 4(') & 4 ' p & 4 & 4 ' p & 4 4 −7 −−−− '
f () 4 p()2 & 4() & 4 6- p & 4 & 4 6- p & 4 4 / −−−− 2
' 8 :
p & 4 4 −6 −−−− 3
2 8 ':6- p & 4 4 / −−−− -
3 − -:
−6 p 4 −6 p 4 '
ubstitute p 4 ' into '(') & 4 4 −74 4 −7 − '
4 −4 4 −
(b) f ( x) 4 x2 − x & x2 − x & 4 x
x2 − 9 x & 4 /( x − )( x − ') 4 /
x 4 , '
9 (a) f ( x) 4 . x − '.
f (−) 4 .(−) − '.
4 .−6. 4 6
f (/) 4 .(/) − '. 4 .−'. 4 '
f () 4 .() − '.
4 .7. 4 7
(b) f ( x) 4 /
. x − '.4 /
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x − ' 4 / x 4 '
10 (a) f : x → tan 3 x f (6/0) 4 tan '/0 4 /
(b) f (3 x) 4 'tan 3 x 4 '3 x 4 -0, 220, -/0
x 4 '0, 70, '30
11 Given f ( x) 4 x − 7 and g ( x) 4 Diberi f-x. x − 7 $an g-x. )
fg ( x) 4 f ( g ( x)) 4 f
4 − 7
4 x − 7 fg (−3) 4 (−3) − 7 4 −
12 (a) f : x → sin x
f (27/0) 4 sin 27/0 4 −'
(b) f ( x) 4 −'
sin x 4 −' x 4 27/0
13 (a) f : x → cos 2 x f (9/0) 4 cos '/0 4 −'
(b) f (2 x) 4 'cos 2 x 4 '2 x 4 /0, 36/0
x 4 /0, '/0
14 Given f ( x) 4 x & - and g ( x) 4 7 x − 2 Diberi f-x. x & $an g-x. 7x − 2)
gf ( x) 4 g ( f ( x)) 4 g ( x & -) 4 7( x & -) − 2
4 7 x & 26 fg ( x) 4 f ( g ( x)) 4 f (7 x − 2) 4 (7 x − 2) & - 4 7 x & 2
15 Given f ( x) 4 x − 9 and fg ( x) 4 − 7 x
Diberi f-x. x − 9 $an fg-x. − 7x) fg ( x) 4 f ( g ( x)) 4 g ( x) − 9
g ( x) − 9 4 − 7 x g ( x) 4 '- − 7 x
∴ g : x → '- − 7 x
16 Given f ( x) 4 − x & 2 and g ( x) 4 Diberi f-x. −x & 2 $an g-x. )
gf ( x) 4 g ( f ( x)) 4 g (− x & 2) 4
gf (') 4
4
17 (a) f (−') 4 −(−') &
4 '/
(b) f ( x) 4 /
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− x & 4 /− x 4 −
x 4 '
18 Given f ( x) 4 and gf ( x) 4 Diberi f-x. $an gf-x. )
gf ( x) 4 g ( f ( x)) 4 g ()5et y 4
o, x 4 g ( y) 4
44 − y −
%he"efo"e, g : x → − x −
19 Given f ( x) 4 7 x & 3 and g ( x) 4 x & 2 Diberi f-x. 7x & 3 $an g-x. 8x & 2)
gf ( x) 4 g ( f ( x)) 4 g (7 x & 3)
4 (7 x & 3) & 2 4 6 x & 26
gf (') 4 6(') & 26
4 2
20 (a) f (2) 4 .(2)2 − . 4 .−'. 4 '
f (7) 4 .(7)2 − .
4 .--. 4 --
f () 4 .()2 − . 4 .9. 4 9
(b) f ( x) 4 -
. x2
− . 4 -o, x2 − 4 - x2 4 9
x 4 −3, 3and−( x2 − ) 4 -
x2 4 ' x 4 −', '