Question: Justify each answer. In each part, A represents an n x n matrix. True or False. If P is an n x n orthogonal matrix,

Justify each answer. In each part, A represents an n x n matrix.

True or False. If P is an n x n orthogonal matrix, then the change of variable x = Pu transforms xTAx into a quadratic form whose matrix is P-1AP.

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