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\fIn Exercises 7-12, find a substitution x = Qy that diag- onalizes the given quadratic form, where Q is orthogo- nal. Also, use Theorem 2 to classify the form as positive definite, positive semidefinite, and so on.In Exercises 13-20, find a substitution X = Qy (where Q is orthogonal) that eliminates the cross-product term in the given equation. Sketch a graph of the transformed equation, where y = [u, v]].