E(x)=(x²+2x+1-4)/x × x²/(x²-x)
E(x)=(x^4+2x³-3x²)/(x³-x²)
E(x)=[x²(x²+2x-3)]/[x²(x-1)]
E(x)=(x²+2x-3)/(x-1)
Δ=b²-4ac=4+12=16
x1=(-b+√Δ)/2a=(-2+4)/2=2/2=1
x2=(-2-4)/2= -6/2= -3
E(x)=[(x-1)(x+3)]/(x-1)
E(x)=x+3
