 # limit of any function is the value of neighboring hood pt. so i directly substitute the value of limit in the functon lim x tend to 3(3x^2-4x-10) = 5 what does it mean i wanna kno why some limits can be found by direct substitution and some by using other formulae... Badiuddin askIITians.ismu Expert
148 Points
12 years ago

Dear himank

If the function is define at that point in which point u are finding the limit then u can find it directlt as an example given by u

x=3 is in the domain of function 3x^2-4x-10  so u can find by direct .

but if the function is not define at the point where u are finding the limit then u can't use the direct method

such as   f(x) = (x2-x )/x   tis function is not define at x=0

so u can't find limit by just direct putting.

in this case u have to take common x and then u can put the value x=0

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