| Author |
Comment/Response |
Bill Simpson
|
 10/24/12 3:19pm
In Response To 'Re: Re: Undefined'
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You have
24+25x+4 Sqrt[10] Sqrt[4-25y]-75y >0
&&
-24-25x+4 Sqrt[10] Sqrt[4-25y]+75y >0
&&
y < 4/25
and you want to substitute {x->1,y->2}.
That gives
In[1]:= 24+25x+4 Sqrt[10] Sqrt[4-25y]-75y/.{x->1,y->2}
Out[1]= -101+(8*I)*Sqrt[115]
In[2]:= -24-25x+4 Sqrt[10] Sqrt[4-25y]+75y/.{x->1,y->2}
Out[2]= 101 + (8*I)*Sqrt[115]
and you want to know whether each of those complex numbers is greater than zero, but there is no way to answer whether a complex is greater than or even less than zero.
That is why you are getting the error message.
What are you really trying to accomplish?
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