4 (a) For the matrix B = find an orthogonal matrix P such that PT BP is a diagonal matrix. (b) Write down the sign property of p = 2x² + 2y² + 2z² – 2xy – 2yz - 2zx. As in 3(c), use an orthogonal transformation to express o in diagonal form. What does the equation p(x, y, z) = 0 mean?

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