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E=x(x^2+4x+3)/(x^2+x-6)
x^2+4x+3=0
discriminante=16-12=4
x1=(-4+2)/2=-2/2=-1
x2=(-4-2)/2=-6/2=-3
entonce x^2+4x+3=(x+1)(x+3)
x^2+x-6=0
discriminante=1-4*(-6)=1+24=25=5^2
x1=(-1+5)/2=4/2=2
x2=(-1-5)/2=-6/2=-3
entonce x^2+x-6=(x-2)(x+3)
de donde E=x(x+1)(x+3)/(x-2)(x+3)
E=x(x+1)/(x-2)