Question

1- considere as matrizes :
A= ( 7 2 ) B= ( 6 12 )
( -1 5 ) ( 9 -3 )

C=( 4 1 ) D= ( -1 4 2 )
( 3 -1 ) ( 0 5 -3)
( 2 5 )

CALCULE:
a) A + B
b) A - B
c) C + D+
d) C+ - D
e) 4.C
f) 2A + 1/3B
g) ( A- 2B)T

Answer 1

a+b= $\left[\begin{array}{cc}7&2\\-1&5\\\end{array}\right]$ + $\left[\begin{array}{cc}6&12\\9&-3\\\end{array}\right]$ = 13  14
                                                                                              8    2
a-b= $\left[\begin{array}{cc}1&-10\\-10&-8\\\end{array}\right]$
c+d= erro
c-d= erro
4.c= $\left[\begin{array}{ccc}16&4\\12&-4\\8&20\end{array}\right]$
2.a+1/3b= $\left[\begin{array}{cc}14&4\\-2&10\end{array}\right]$ + $\left[\begin{array}{cc}2&4\\3&-1\end{array}\right]$ = $\left[\begin{array}{cc}16&8\\1&\end{array}\right]$
(a-2b)=$\left[\begin{array}{cc}-5&-22\\-19&11\end{array}\right]$