Answer: Classify the quadratic forms in Exercise. Then
Chapter 7, Problem 11E(choose chapter or problem)
Classify the quadratic forms in Exercises 9–18. Then make a change of variable, x = Py, that transforms the quadratic form into one with no cross-product term. Write the new quadratic form. Construct P using the methods of Section 7.1.
\(2 x_{1}^{2}-4 x_{1} x_{2}-x_{2}^{2}\)
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