Calc I
posted by Kate .
Yes I was trying to find the range
y = (x^2 4)/(x^2  x 12)
ok using 2(4 +/ sqrt(15) )
sorry I forgot the minus in the derivitive but ya that makes sense but however I need three critical values that only gives me graph it and you'll see there are three how do I find the third one one

Calc I 
Kate
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