Infinity is a concept, not an actual number.
Someone may say the number of stars is infinite, or that the number of fractions between 0 and 1 is infinite, or that the number of even numbers is infinite. But these are not things that can be subtracted.
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both are equal... infinity is the representation of undefined.
Value of log 0 is negative infinity (undefined). Because no power can give an answer of zero. it is in fact undefined but written as negative infinity for symbolizing. Otherwise undefined and infinity are two different things.
2-2+0 therefore 9 /0 = infinity - undefined or 9/2 = 4.5 - 2 = 2.5
When the denominator is equal to zero, the expression is undefined. Close to those places, the expression tends towards plus infinity, or minus infinity. In other words, setting the denominator to zero will tell you where there are vertical asymptotes.
Undefined: You cannot divide by zero