a)
[tex]( - 2) + 3 + 3 = - 2 + 3 = 4[/tex]
b)
[tex]x + x + 3 = 203 \\ 2x = 200 \\ x = 100[/tex]
x apartine lui R
c)
[tex]x + {x}^{2} + 3 = 5 \\ {x}^{2} + x - 2 = 0 \\ [/tex]
delta= 9
x1= (-1+3)/2=1 -> apartine lui R
x2=(-1-3)/2=-2 -> apartine lui R
