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280<br />

Contoh 8.2.7<br />

Tentukan semua turunan dari fungsi f yang diberikan oleh<br />

f (x) = 5x4 + 4x3 – x2 + 9<br />

Penyelesaian:<br />

f '( x ) = 20x3 + 12x2 – 2x<br />

f "( x ) = 60x2 + 24x – 2<br />

f '"( x ) = 120x + 24<br />

(4)<br />

f ( x ) = 120<br />

( n)<br />

f ( x) = 0, n≥5<br />

1. Tentukan f '( x ) untuk setiap fungsi yang diberikan.<br />

a. f (x) = 4x4 + 4x2 + 1 i. f (x) = (x3 – 2x +3)(3x2 + 2x)<br />

b. f (x) = 1 – 2x – x3 j. f (x) = 3 2<br />

9 x<br />

c. f (x) = x7 – 4x5 + 2x3 + 7x k. f (x) = 2 x + 5 x<br />

d. f (x) = x 2 + 3x +<br />

2<br />

1 x l.<br />

e. f (x) = x 4 – 7 + x -2 + x -4 m.<br />

f. f (x) = (3x 2 + 4) 2 n.<br />

g. f (x) = (2x 2 + 3)(5x – 8) o.<br />

h. f (x) = (5x 4 – 3)(2x 3 + 6x)<br />

2. Tentukan dy<br />

dx<br />

a. y = (x 2 + 3x +2)(2x 3 – 1) d.<br />

b.<br />

c.<br />

Latihan 8.2<br />

x<br />

y =<br />

x − 2<br />

2x+ 1<br />

y =<br />

3x+ 4<br />

2 1<br />

3 3<br />

f( x) 3x<br />

x −<br />

= −<br />

2x<br />

f( x)<br />

=<br />

x + 4<br />

2<br />

x − 2x+ 1<br />

f( x)<br />

= 2<br />

x + 2x+ 1<br />

x<br />

f( x)<br />

=<br />

x<br />

untuk setiap y yang diberikan.<br />

4−3x−x y =<br />

x − 2<br />

2x<br />

e. y = 2<br />

1+ 5x<br />

f.<br />

4 2<br />

2<br />

3<br />

3<br />

+ 8<br />

− 8<br />

g.<br />

h.<br />

x − 2x + 5x+ 1<br />

y = 4<br />

i.<br />

x<br />

2 2<br />

x − a<br />

y =<br />

x + a<br />

2 2<br />

2x+ 1<br />

y= (3x−1) 3x+ 4<br />

Matematika SMA/MA Kelas XI - IPA<br />

3<br />

x +<br />

y= x +<br />

3<br />

x + 3<br />

1 2<br />

( 1)<br />

W

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