https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-intro-to-matrix-inverses/v/inverse-matrix-part-1 2021-04-07T12:54:01Z Intro to matrix inverses Sal introduces the concept of an inverse matrix. Sal Khan video https://cdn.kastatic.org/googleusercontent/gaP33Su-eb3su00EkUKrnAq2pEfz0iRAezL0E4T-Zfq9XoJryT2cH7CBRP12IZuHOrJbT4C3lXNEs8xn31RrA5-sHQ Intro to matrix inverses Sal introduces the concept of an inverse matrix. https://cdn.kastatic.org/ka-youtube-converted/iUQR0enP7RQ.mp4/iUQR0enP7RQ.mp4 854 Finding the inverse of a matrix https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-intro-to-matrix-inverses/v/singular-matrices 2021-04-07T12:54:01Z Determining invertible matrices Sal shows why a matrix is invertible if and only if its determinant is not 0. Sal Khan video https://cdn.kastatic.org/googleusercontent/tZj7kLtIRp1bdUwl-CoTBnYO2khps6j7W6HjcMkwmWgZ0PPvHxR09ILUYeRdnfVdfCOfnIIAHQN2XvsPKKmghtUK Determining invertible matrices Sal shows why a matrix is invertible if and only if its determinant is not 0. https://cdn.kastatic.org/ka-youtube-converted/UqyN7-tRS00.mp4/UqyN7-tRS00.mp4 867 Finding the inverse of a matrix https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:matrices/x9e81a4f98389efdf:practice-finding-inverses-of-2x2-matrices/v/inverse-of-a-2x2-matrix 2021-04-07T12:54:01Z Finding inverses of 2x2 matrices Sal gives an example of how to find the inverse of a given 2x2 matrix. Sal Khan video https://cdn.kastatic.org/googleusercontent/Zhtb3TMtteCfrfkom7uDdbko0cOZF4DHd6o1PvFMY1nmk-MD0Z_UG__wwti1AqsXSgaV_7HUQDTkHv_sBzu1dLNs Finding inverses of 2x2 matrices Sal gives an example of how to find the inverse of a given 2x2 matrix. https://cdn.kastatic.org/ka-youtube-converted/01c12NaUQDw.mp4/01c12NaUQDw.mp4 168 Finding the inverse of a matrix https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-determinants-and-inverses-of-large-matrices/v/inverting-matrices-part-3 2021-02-05T04:23:34Z Inverting a 3x3 matrix using Gaussian elimination Sal explains how we can find the inverse of a 3x3 matrix using Gaussian elimination. Sal Khan video https://cdn.kastatic.org/googleusercontent/S5tnRG37P8hrJ_Th7Eah-_vp-MAc9MK5lelpgF5uTnTCjY_66MNoEKJT3giRnuiD40fs7ZtT7_mx4Kc549wRT1AS Inverting a 3x3 matrix using Gaussian elimination Sal explains how we can find the inverse of a 3x3 matrix using Gaussian elimination. https://cdn.kastatic.org/ka-youtube-converted/obts_JDS6_Q.mp4/obts_JDS6_Q.mp4 816 Finding the inverse of a matrix https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-determinants-and-inverses-of-large-matrices/v/inverting-3x3-part-1-calculating-matrix-of-minors-and-cofactor-matrix 2021-02-05T04:23:35Z Inverting a 3x3 matrix using determinants Part 1: Matrix of minors and cofactor matrix Sal shows how to find the inverse of a 3x3 matrix using its determinant. In Part 1 we learn how to find the matrix of minors of a 3x3 matrix and its cofactor matrix. Sal Khan video https://cdn.kastatic.org/googleusercontent/VFoUY4Tb7tiqreXMgm3oKyXVpDcgRDl4qzJ3wkqpWvDK6_pP3EQOYgkunclpYCAJJy954PxHkUKB_WzyqRsmPMNuHg Inverting a 3x3 matrix using determinants Part 1: Matrix of minors and cofactor matrix Sal shows how to find the inverse of a 3x3 matrix using its determinant. In Part 1 we learn how to find the matrix of minors of a 3x3 matrix and its cofactor matrix. https://cdn.kastatic.org/ka-youtube-converted/xZBbfLLfVV4.mp4/xZBbfLLfVV4.mp4 527 Finding the inverse of a matrix https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-determinants-and-inverses-of-large-matrices/v/inverting-3x3-part-2-determinant-and-adjugate-of-a-matrix 2021-02-05T04:23:35Z Inverting a 3x3 matrix using determinants Part 2: Adjugate matrix Sal shows how to find the inverse of a 3x3 matrix using its determinant. In Part 2 we complete the process by finding the determinant of the matrix and its adjugate matrix. Sal Khan video https://cdn.kastatic.org/googleusercontent/HjbcA6GCOwBFYHU2IiQTR5qmk_w41f2pFcrTucwIgERMhbRzDTF6_mJmokZiOSK_SNUfGgDpP-45zumoKa0I9n_Cfw Inverting a 3x3 matrix using determinants Part 2: Adjugate matrix Sal shows how to find the inverse of a 3x3 matrix using its determinant. In Part 2 we complete the process by finding the determinant of the matrix and its adjugate matrix. https://cdn.kastatic.org/ka-youtube-converted/ArcrdMkEmKo.mp4/ArcrdMkEmKo.mp4 383 Finding the inverse of a matrix https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-intro-to-matrix-inverses/e/determine-inverse-matrices 2025-05-05T08:14:25.350149109Z Determine inverse matrices Given a pair of matrices, determine whether they are inverses of each other. Sulinya exercise https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:matrices/x9e81a4f98389efdf:intro-to-matrix-inverses/e/determine-invertibile-2x2-matrices 2025-05-05T08:14:25.350149109Z Determine invertible matrices Determine whether a 2x2 matrix has an inverse by either thinking about its determinant or about its effect on the unit square. Tomer Gal exercise https://www.khanacademy.org/math/algebra-home/alg-matrices/alg-determinants-and-inverses-of-large-matrices/e/matrix_inverse_3x3 2026-03-24T23:41:07.080866137Z Inverse of a 3x3 matrix Find the inverse of a given 3x3 matrix. Stephanie Chang exercise