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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 3. Tangentplan 66<br />

3.25. Opgave ☞ [S] 11.4 Tangent planes and linear approximations<br />

Øvelse 9<br />

f(x,y) = x √ y<br />

Begrund differentiabilitet om (1,4) og find den lineære approximation.<br />

Løsning<br />

er kontinuerte om (1,4).<br />

når (x,y) ≈ (1,4).<br />

fx = √ y, fy = x<br />

2 √ y<br />

x √ y ≈ 2 + 2(x − 1) + 1<br />

(y − 4)<br />

4<br />

3.26. Opgave fortsat<br />

Øvelse 9 - fortsat<br />

☞ [S] 11.4 Tangent planes and linear approximations<br />

Skrives også<br />

(1 + ∆x) 4 + ∆y ≈ 2 + 2∆x + 1<br />

4 ∆y<br />

Beregn tilnærmelse<br />

0.9 √ 4.4 ≈ 2 + 2(−0.1) + 1<br />

0.4 = 1.9<br />

4

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