x(x^2-16)/(x-4)^2=x(x-4)(x+4)/(x-4)^2=(2x+8)/(x-4)
...=15/(-0.5)=-30
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x(x^2-16)/(x-4)^2=x(x-4)(x+4)/(x-4)^2=(2x+8)/(x-4)
...=15/(-0.5)=-30