No description given

$A$ a $3 \times 3$ matrix. Using row operations on the augmented matrix $\left(A | I_3\right)$ reduce to $\left(I_3 | A^{-1}\right)$.

Putting a pair of linear equations into matrix notation and then solving by finding the inverse of the coefficient matrix. 

$A$ a $3 \times 3$ matrix. Using row operations on the augmented matrix $\left(A | I_3\right)$ reduce to $\left(I_3 | A^{-1}\right)$.

Exercises in multiplying matrices. 

Multiplication of $2 \times 2$ matrices.

Multiplication of $2 \times 2$ matrices.

Putting a pair of linear equations into matrix notation and then solving by finding the inverse of the coefficient matrix. 

Multiplication of $2 \times 2$ matrices.

$A$ a $3 \times 3$ matrix. Using row operations on the augmented matrix $\left(A | I_3\right)$ reduce to $\left(I_3 | A^{-1}\right)$.

Solving a system of three linear equations in 3 unknowns using Gauss Elimination in 4 stages. Solutions are all integral.

Find the critical point  $(0,a)$ of the function: $f(x,y)=ax^3+bx^2y+cy^2+dy+f$ and find its type using the test given by the Hessian matrix.

Multiplication of $2 \times 2$ matrices.

Multiplication of $2 \times 2$ matrices.

Multiplication of $2 \times 2$ matrices.