Question

Prove the follow using properties

\(\begin{bmatrix} 1 &1 + p& 1 + p + q \\[0.3em] 2& 3 + 2p & 4 + 3p + 2q \\[0.3em] 3 & 6 + 3p & 10 + 6p + 3q \end{bmatrix}\) = 1

Answer 1

= 7 + 3p - 6 - 3p = 1