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274<br />

Teorema 8.4<br />

Misalkan u suatu fungsi, k konstanta, dan f fungsi yang didefinisikan oleh<br />

f (x) = ku(x). Jika u mempunyai turunan, maka<br />

f '( x) = ku'( x)<br />

Bukti:<br />

Dari Definisi 8.1,<br />

f '( x ) =<br />

=<br />

lim<br />

h→0<br />

lim<br />

h →0<br />

f( x+ h) − f( x)<br />

h<br />

ku( x + h) −ku(<br />

x)<br />

h<br />

ux ( + h) −ux<br />

( )<br />

= lim k<br />

h→0<br />

h<br />

ux ( + h) −ux<br />

( )<br />

= k lim<br />

h→0<br />

h<br />

= ku '( x)<br />

Sebagai contoh sederhana, jika f (x) = 8 x 5 , maka<br />

Teorema 8.5<br />

4 4<br />

f '( x) = 5 ⋅ 8x = 40x<br />

Misalkan u dan v dua fungsi, dan f fungsi yang didefinisikan oleh f (x) = u(x) + v(x).<br />

Jika u dan v mempunyai turunan, maka<br />

f '( x) = u'( x) + v'( x)<br />

Bukti:<br />

f( x+ h) − f( x)<br />

f '( x ) = lim<br />

h→0<br />

h<br />

[ ux ( + h) + vx ( + h)] − [ ux ( ) + vx ( )]<br />

= lim<br />

h→0<br />

h<br />

[ ux ( + h) − ux ( )] + [ vx ( + h) −vx<br />

( )]<br />

= lim<br />

h→0<br />

h<br />

ux ( + h) −ux<br />

( ) vx ( + h) −vx<br />

( )<br />

= lim<br />

+ lim<br />

h→0<br />

h<br />

h→0<br />

h<br />

= u '( x) + v'( x)<br />

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

W<br />

W

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