Show that if two real symmetric matrices A, B are congruent then there is a linear...

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Show that if two real symmetric matrices A, B are congruent then there is a linear change of variables to x1, x such that q(x1,...,xn) = qB(x,,xn). Show that if two real symmetric matrices A, B are congruent then there is a linear change of variables to x1, x such that q(x1,...,xn) = qB(x,,xn).