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(20=10+5+5 points) Let 2 1 1] A = 1 2 1 . 11 1 2 (a) Find the spectral decomposition of A, i.e., represent it as a linear com

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1 @ A 211 11 2 Li 1 2 ! To find eigen values and eigen vectors. 1-x+2 III i-X+21 = li I eat! 31+ (-*+233–4=0. 1, = 1, .de = 116-17v7 o 0 Lo o o JL ol- Take &z=t, vt, vt Now A tilt deletish P = 8 vit, de dor, Pz 2 V3 V5 lo o od -1 o 1 Lill [2! 11 1 1unique the definite square root ① Now A- PORI We also have An- Ponpr Now we have to compute (Pozp-2 in 12/2018 _ I we can -i

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