(Solution Download) If X x1 xn T is a


If X = [x1 ? ? ? xn]T is a column of variables, A = AT is n × n, B is 1 × n, and c is a constant, XTAX + BX = c is called a quadratic equation in the variables xj.
(a) Show that new variables y1,... ,yn can be found such that the equation takes the form
?1y21 + ? ? ? + ?ry2r + k1y1 + ? ? ? + knyn = c.
(b) Write x21 + 3x22 + 3x32 + 4x1x2 - 4x1x3 + 5x1 - 6x3 = 7 in this form and find variables y1, y2,y3 as in (a).

 







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