In Exercises 21–23, use determinants to find out if the matrix is invertible.
21.
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- Compute the determinants in Exercises 1-6 using cofactor expansion along the first row and along the first column. 5.arrow_forwardIn Exercises 26-34, use properties of determinants to evaluate the given determinant by inspection. Explain your reasoning. 34.arrow_forwardFind the determinant of the matrix in Exercise 15 using the method of expansion by cofactors. Use a the second row and b the second column. 15. [321456231]arrow_forward
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