Question

Determine o conjunto solução das seguintes equações:
a) $\left[\begin{array}{ccc}3&x&\\2&4&\\&&\end{array}\right] =0$

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

c)$\left[\begin{array}{ccc}2x&-4&\\8&3&\\&&\end{array}\right] = 38$

d)$\left[\begin{array}{ccc}x+1&3&\\1&2&\\&&\end{array}\right] = 7$

Answer 1

a) 4-2-3=0
-9= x
x =-9
b)9-3-(-1)=0
-7=x
x=-7
c) 38-8-3-(-4)=0
2x=31
x=31/2
x=15,5
d)7-3-2-1=0
1=x+1
x=1-1
x= 0