Question

sendo A= [5 0 -1
3 2 -4
-2 7 1]
calcule:
a) det A b) det (2A)

Answer 1

a) detA $\left[\begin{array}{ccc}5&0&-1\\3&2&-4\\-2&7&1\end{array}\right] \left[\begin{array}{ccc}5&0\\3&2&\\-2&7\end{array}\right]$
10-21+140-4=125
b)80-168+1120-32=1000