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FUNCIONS (I) - textos online

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Exemples:<br />

y = 2x + 2<br />

si x = 0, y = 2 (0 , 2)<br />

si y = 0, x = –1 (–1 , 0)<br />

y = 2x 2 – 4x + 5<br />

si x = 0, y = 5 → (0, 5)<br />

4 <br />

si y = 0, 0 = 2x 2 – 4x + 5 x = <br />

y = –x 2 + 3x + 4<br />

24<br />

16 40<br />

4<br />

si x = 0, y = 4 → (0, 4)<br />

si y = 0, 0 = –x 2 3 <br />

+ 3x + 4 x =<br />

9 16 2<br />

<br />

3 5<br />

<br />

2<br />

Aquesta funció té tres punts de tall: (0 , 4) ; (1 , 0) ; (– 4 , 0)<br />

1<br />

y =<br />

x<br />

1<br />

si x = 0, y = no té solució<br />

0<br />

1<br />

si y = 0, 0 = 0.x = 1 no té solució<br />

x<br />

Té dos punts de tall: (0 , 2) i ( –1 , 0)<br />

Té un únic punt de tall:<br />

(0 , 5)<br />

3 5 2<br />

1<br />

2 2 x<br />

<br />

<br />

3 5 8<br />

4<br />

2 2 x<br />

<br />

<br />

Aquesta funció no<br />

té punts de tall

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