MATH 251 Final: MATH 304 TAMU FinalpracticeSolutions

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31 Jan 2019
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Problem 3: let f (x) = x3, g(x) = ex, and h(x) = e x. Show that f, g, h are linearly inde- pendent (as vectors in the vector space of continuous functions on r). One approach is to compute the wronskian: x3 ex e x. 6x ex e x (cid:12)(cid:12)(cid:12)(cid:12)(cid:12)(cid:12) which simpli es to (cid:12)(cid:12)(cid:12)(cid:12)(cid:12)(cid:12) = x3(exe x + e xex) ex(3x2e x + e x6x) + e x(3x2ex ex6x) 2x3 3x2 6x + 3x2 6x = 2x3 12x. This function is not the zero function, so f, g, and h are linearly independent. (it"s okay that the wronskian is zero for some values of x, as long as it"s not zero everywhere. ) Problem 5: find the eigenvalues and corresponding eigenspaces of the matrix a = (cid:18) 3 1 (cid:12)(cid:12)(cid:12)(cid:12) so the only eigenvalue is 2, or if you like, 1 = 2 = 2.

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