How do you find the domain of f(x)=4x√x−4?

1 Answer
Dan
Nov 6, 2015

Domain = (4, ∞)

Explanation:

When looking for domain, it is the x values that exist from negative infinity to positive infinity. For this equation, if you plug in any number where x≤4, we got either a negative number or √0, both of which do not exist. However any value x > 4, the denominator gives us a real value. Because of this, x exists from 4 to ∞. You use a parenthesis next to 4 and not a bracket because 4 is not included in the domain.

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