Posted by Mishaka on Wednesday, November 9, 2011 at 7:05pm.
lim x>0 (-500/(x+h) - 500/x )/h
= lim -500(x-(x+h))/h(x*(x+h)
= lim -500 (-h/h(x*(x+h))
= lim +500 (1/x(x+h))
= 500/x^2
Your teacher is just too easy.
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