Finding the implied domain of a function

Learn how to find the domain of a radical function. Recall that the domain of a function is the set of possible input values (x-values) of the function. For a radical square-root function, there cannot be a negative number inside the radical. Thus, to find the domain of a radical square root function, we set up the value inside the radical as an inequality greater than or equal to 0 and solve for the inequality for the variable.

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18 thoughts on “Finding the implied domain of a function

  1. Also, what if u had a plus inside teh square root of teh first function instead of a minus? How would taht work? Since u can't possibly do difference of squares there nor simplify

  2. Hey. So u didn't explain how to find the range of each function. Can u please make a video on that as well? And if not, can u tell me how

  3. I always have a hard time determining whether a problem’s solution is all real numbers or has one solution, this helps enlighten me more, thanks!

  4. These videos are incredibly helpful and super easy to follow! I work a lot and can only attend night school once a week making it hard to pick up where we leave off in class, so finding a math teacher who has a video for everything we learned and explaining in detail the lessons is amazing! Thank you so much!

  5. i have a question that i have asked various physicst and mathematicians they all seem to give differnet theorys or do not no can you please tell me how i can explain an implied infinative inside a math equation?

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