Diagonalise the matrix 𝐴 = [ 𝑎 𝑏 𝑐 𝑑 ], where 𝑎 + 𝑐 = 𝑏 + 𝑑, by finding a nonsingular matrix 𝑃 and a diagonal matrix 𝐷 such that 𝐴 = 𝑃𝐷𝑃 −1 .
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Expert's answer
2021-01-25T14:59:51-0500
let A =[3241]to get the eigen values, t2−tr(A)t−∣A∣t2−4t−5=(t+1)(t−5)λ1=−1,λ2=5to compose the eigen vectors,[3−(−1)241−(−1)]=[4242]corresponding to4x+4y=0the eigen vector isv1=∣∣−11∣∣also, [3−(5)241−(5)]=[−224−4]corresponding to2x−4y=0,x−2y=0the eigen vector isv2=∣∣21∣∣then p=[−1121]p−1=−31[1−1−2−1]setting D to be a diagonal matrixD=[−1005]A=PDP−1
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