a)x apartine lui R-{-3}
b)(2x^3+2)/(x+3)^2:(x^2-x+1)/x+3=2(x+1)(x^2-x+1)/x+3 * 1/x^2-x+1=2(x+1)/x+3
c)E(-1/2)=2(-1/2+1)/-1/2+3
E(-1/2)=2/5
d)x+3/(divide)2x+2
x+3/x+3=>x+3/2x+6
x+3/2x+2
x+3/2x+6-2x-2
x+3/4
x+3 este un diviz al lui 4
x+3=1 x=-2
x+3=2 x=-1
x+3=4 x=1