Find an orthogonal matrix P that orthogonally reduces the quadratic form Q(x) = x" Ax sa} + 3.x3 + 2x3 x1x2 + 8x2x3 to the standard form y = = P-lx, 1 -1/2 07 Q(y) = A1yỉ + + \3y3, where A = |-1/2 3 4 .. 4

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