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y<br />

0 x 0 = a x 1 x 2 x 3 x 4 x 5 x 6 x 7<br />

x<br />

Gambar 5.5<br />

Teorema 6.4.2<br />

Jika suatu f kontinu pada selang tertutup [a,b] maka f setidak-tidaknya mempunyai<br />

satu nilai maksimum dan minimum [a,b].<br />

Contoh 6.6<br />

Jika diketahui f(x) = x 2 + 5x + 6, tentukan nilai ekstrim f untuk selang-selang berikut :<br />

a) [-2,0] b) (-3, 1) c) [-3,-2) d) (-1,1]<br />

Penyelesaian :<br />

y<br />

y<br />

x<br />

-2 0 -3 0 1<br />

(a)<br />

(b)<br />

x<br />

y<br />

y<br />

x<br />

-3 -2 0 -1 1<br />

(d)<br />

( c )<br />

Gambar 5.6<br />

x<br />

134

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