## MIT 1802 – lecture 3 (Multivariable calculus)

This lecture was the first I took notes for from the MIT video series on multivariable calculus. It covered calculating the inverse of a 3×3 matrix. The answer is, to invert matrix , find the **determinant **of and the **adjoint **of .

The steps are:

1) find the MINORS (a 3×3 matrix)

2) multiply by the COFACTORS (a +/- matrix alternating with a + in upper left corner)

3) TRANSPOSE the matrix (switch rows and columns)

4) MULTIPLY by one over the determinant of A

Advertisements

**Explore posts in the same categories:**Math

## Leave a Reply