Question

1- Construa as matrizes:
a) A = [a] 3x2, tal que a,= 3i+ 4j​

Answer 1

$\boxed{\begin{array}{l}\sf A=[a_{ij}]_{3\times2}~tal~que~a_{ij}=3i+4j\\\rm A=\begin{bmatrix}\sf a_{11}&\sf a_{12}\\\sf a_{21}&\sf a_{22}\\\sf a_{31}&\sf a_{32}\end{bmatrix}\\\sf a_{11}=3\cdot1+4\cdot1=7\\\sf a_{12}=3\cdot1+4\cdot2=3+8=11\\\sf a_{21}=3\cdot2+4\cdot1=6+4=10\\\sf a_{22}=3\cdot2+4\cdot2=6+8=14\\\sf a_{31}=3\cdot3+4\cdot1=9+4=13\\\sf a_{32}=3\cdot3+4\cdot2=9+8=17\\\rm A=\begin{bmatrix} \sf7&\sf11\\\sf10&\sf14\\\sf13&\sf17\end{bmatrix} \end{array}}$