Question

obtenha o valor de A para o qual | a -3 4 | | 6 -2 2 | | 8 -1 3 | = 0

Answer 1

| a -3 4 | a -3
| 6 -2 2 | 6 -2
| 8 -1 3 | 8 -1

+64 +2a +54 -6a -48 -24 = 0
+64 +54 -48 -24 = -2a +6a
+118 -72 = 4a
+46 = 4a
46/4 = a
a = 46/4
a = 23/2