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College Algebra 2e

Key Equations

College Algebra 2eKey Equations

Key Equations

Identity matrix for a 2×2 2×2 matrix I 2 =[ 1 0 0 1 ] I 2 =[ 1 0 0 1 ]
Identity matrix for a 3×3 3×3 matrix I 3 =[ 1 0 0 0 1 0 0 0 1 ] I 3 =[ 1 0 0 0 1 0 0 0 1 ]
Multiplicative inverse of a 2×2 2×2 matrix A −1 = 1 ad−bc [ d −b −c a ],where ad−bc≠0 A −1 = 1 ad−bc [ d −b −c a ],where ad−bc≠0
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