Question

Na matriz A= 3 4
x 5 qual o valor de x para que o determinante seja igual a 3?

Answer 1

$\left[\begin{array}{ccc}3&4\\x&5\\\end{array}\right]$

3.5 - 4x = 3

15+4x=3

4x = -12

x= -12/4

Resposta:

x= 3