Compute the determinants in Exercises 9–14 by cofactor expansions. At each step, choose a row or column that involves the least amount of computation.
12.
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- 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. 11. 2x² + 10x1x2 + 2x3arrow_forward4 11. 5 3 2 -2 2arrow_forwardCompute the determinants in Exercises 1–8 using a cofactor expansion across the first row.arrow_forward
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