Compute the product $AB$ of the two matrices below using both the definition of the matrix-vector product (Definition MVP) and the definition of matrix multiplication (Definition MM). \begin{align*} A&= \begin{bmatrix} 3 & 1 \\ 2 & 4 \\ 6 & 5\\1 & 2 \end{bmatrix} & B&= \begin{bmatrix} -3 & 1 \\ 4 & 2 \end{bmatrix} \end{align*}