Question

Construa a matriz A= (aij) 3x3 definida por aij= (-1) i+j, se i = j e aij =1, se i=j

Answer 1

$A= \left[\begin{array}{ccc}(-1)^2&(-1)^3&(-1)^4\\(-1)^3&(-1)^4&(-1)^5\\(-1)^4&(-1)^5&(-1)^6\end{array}\right] \\ \\ A= \left[\begin{array}{ccc}1&-1&1\\-1&1&-1\\1&-1&1\end{array}\right]$