Question

respondem só a letra c da atividade 57 pf

Answer 1

1.achar a matriz inversa  B-1

B-1.B=matriz Identidade

$\left[\begin{array}{cc}a&b\\c&d\\\end{array}\right]$ . $\left[\begin{array}{cc}0&1\\-3&4\\\end{array}\right]$ = $\left[\begin{array}{cc}1&0\\0&1\\\end{array}\right]$

B-1=$\left[\begin{array}{cc} \frac{4}{3} & \frac{-1}{3} \\1&0\\\end{array}\right]$

2.multiplicamos agora  B-1.A=C

$\left[\begin{array}{cc} \frac{4}{3} & \frac{-1}{3} \\1&0\\\end{array}\right]$ .$\left[\begin{array}{cc}3&2\\1&1\\\end{array}\right]$=C

3. resultado de C=$\left[\begin{array}{cc} \frac{11}{3} & \frac{7}{3} \\3&2\\\end{array}\right]$