What is the domain of F(x) = In(x)?

Answer as an inequality:  

Answer in interval notation:  

Answer in words: Set of positive real numbers

All three represent the same idea, but in different forms.

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Explanation:

Any log is the inverse of an exponential equation. Consider a general base b such that f(x) = b^x. The inverse of this is

For the exponential b^x, we cannot have b^x = 0. We can get closer to it, but we can't actually get there. The horizontal asymptote is y = 0.

Because of this, has a vertical asymptote x = 0 (recall that x and y swap, so the asymptotes swap as well). This means we can get closer and closer to x = 0 from the positive side, but never reach x = 0 itself.

The domain of is x > 0 which in interval notation would be . This is the interval from 0 to infinity, excluding both endpoints.

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The natural log function Ln(x) is a special type of log function where the base is b = e = 2.718 approximately.

So,

allowing all of what was discussed in the previous section to apply to this Ln(x) function as well.

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In short, the domain is the set of positive real numbers. We can't have x be 0 or negative.

hello :

70y^8 + 30y^6 = 2 ( 35 y^8 + 15y^6)

the lenght is : 35 y^8

the width is : 15y^6