11.07.2015 Views

RIJEÅ ENI ZADACI IZ MATEMATIKE

RIJEÅ ENI ZADACI IZ MATEMATIKE

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39. Ispitajte je li matrica A · A T ∈ M 2 regularna ako je A =Rješenje:[ ] 0 −11 0det(A · A T ) ≠ 0detA · detA T ≠ 0detA = detA TdetA · detA ≠ 0∣ 0 −11 0 ∣ = 0 · 0 − (−1) · 1 = 1detA · detA = 1 · 1 = 1 ≠ 0Matrica A · A T je regularna.41

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