1. 90x^2-4x^3 2. 2x^2 + 16000/x 3. 2*pie*r^2 + 2000/r I think the first is all but 0, not sure about rest, thanks.
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why can't you let x = 0 for the first? if x = 0, the expression = 0 ... that's ok, isn't it? can't use x = 0 for the second ... division by zero is a no-no, correct? so, what can r not be in the third?
I would say r cannot be 0 in the 3rd as well.
Originally Posted by bakeit1 I would say r cannot be 0 in the 3rd as well. Correct.
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