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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 2. 1. ordens ligninger 341<br />

Opgave 2 - fortsat<br />

Egenværdierne findes som rødder i det karakteristiske polynomium<br />

<br />

<br />

|A − λI2| = 1<br />

− λ 2 <br />

<br />

2 1 − λ<br />

Egenværdier<br />

= λ 2 − 2λ − 3<br />

λ1 = −1, λ2 = 3<br />

2.34. Opgave ☞ [LA] 15 Lineært system<br />

Opgave 2 - fortsat<br />

Egenvektorer hørende til egenværdien −1:<br />

A + I =<br />

<br />

2 2<br />

∼<br />

2 2<br />

giver egenvektorer <br />

x1 −x2<br />

=<br />

x2<br />

x2<br />

= x2<br />

<br />

1 1<br />

0 0<br />

<br />

−1<br />

1<br />

2.35. Opgave ☞ [LA] 15 Lineært system<br />

Opgave 2 - fortsat

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