題組內容

3. [25%] Let A= (a1, a2, a3, a4) = 6302d1a42b595.jpg , where ai  is the 6302d24456f8b.jpgcolumn vector of Aand i = 1, 2, 3, 4.

(e) Find a nonzero vector x in R3, which is orthogonal to both a1 and a 2. (5%)