P(-1)= (-1)^4 +3*(-1)^3 -(-1)^2 -2*(-1)+3=1-3-1+2+3=2 nie
P(\frac{1}{2})=
(\frac{1}{2})^4 +3*(\frac{1}{2})^3 -(\frac{1}{2})^2 -2*(\frac{1}{2})+3=
\frac{1}{16} +3*\frac{1}{8} -\frac{1}{4} -1+3
=\frac{1}{16} +\frac{3}{8} -\frac{1}{4}+2
=\frac{1}{16} +\frac{6}{16} -\frac{4}{16}+2=
\frac{3}{16}+2=2\frac{3}{16} nie