B matrix definition

[tingkai-li]

I found an inconsistency in the definition of B matrix. In the problem statement of Quiz 8, the B matrix is defined as

$$ \mathbf{B} = \begin{bmatrix} \mathbf{C_{qd}^{-1} C_{qi}}\\1 \end{bmatrix}; $$

but in the lecture note and textbook, it is defined as

$$ \mathbf{B} = \begin{bmatrix} -\mathbf{C_{qd}^{-1} C_{qi}}\\1 \end{bmatrix}. $$

Which definition should be the correct one to use?

[travismalave]

During the Q&A it was agree that the second is correct (-Cqd^-1) and the Quiz 08 had a typo.

[tingkai-li]

Thank you! I wasn't able to make it to today's session.