Question

Dada as matrizes A= 2 x e
3 9
B= 1 - 1 0
2 3 x
-1 2 1
determine x para que det A = det B.​

Answer 1

Resposta:

Explicação passo-a-passo:

$\left[\begin{array}{ccc}2&x\\3&9\\\end{array}\right]=\left[\begin{array}{ccc}1&-1&0\\2&3&x\\-1&2&1\end{array}\right]$

vamos resolver:

$2.9-3x=3+x+0-0-2x+2$

$18-3x=5-x$

$13=2x$

$x=\frac{13}{2}$