a) -x⁴+9x²+x-1
b) gradul este 4
c)calculam P(1)
P(1)=-1⁴+9+1-1=-1+9=8
d)-x⁴+9x²+x-1-x+1=0
-x⁴+9x²=0
-x²(x²-9)=0
x₁=x₂=0
(x-3)(x+3)=0
x₃=3
x₄=-3
e) dupa impartire obtinem C(x)=-x²+8 si R(x)=x+7
2)a)F
b)E(x)≠0
x²+8≠0
x²≠-8
x²+5≠0
x²≠-5
nu sunt solutii reale
c) (4x²+20-3x²-24) / (x²+8)(x²+5) ·1/2(x²+16)=
(x²-4) /2(x²+8)²(x²+5)
d)x(x²-4)=0
x₁=0
(x-2)(x+2)=0
x₂=2
x₃=-2nu este solutie
