a. Sketch the Gershgorin disks for the matrix 2 -1 A = -2 -10 -1 -1 4 and give a bound for the spectral radius, p(A). b. Determine an upper and lower bound for p(A), using ||A||1, where 1 1 A = 1 4 0 0 0 3 and then repeat using Gershgorin's Theorem.

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