How to find the domain of a radical function

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👉 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 the inequality for the variable.

Organized Videos:
✅ How to find the domain of a function
✅Domain of a function with square root | Medium
✅Domain of a function with square root | Quadratic
✅Domain of a function with square root | Easy
✅Domain of a function with square root | Hard
✅Domain of a function with a fraction | Hard
✅Domain of a function with a fraction | Easy
✅Domain of a function with a fraction | Quadratic
✅Domain of a function with a fraction | Medium
✅Domain of a function with a fraction | Linear
✅Domain of a function with a square root in the denominator
✅Domain of a function with a square root in the numerator
✅Domain of a function with a square root in the numerator and denominator

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This man has single-handedly helped an entire generation grind for their tests. That’s a hero to me 👍🏻👍🏻

zmbently

ur literally a life saver. ive got a test tomorrow and i had no idea how to do these! thank you so much!!

alexshap

You helped me understand domains of radicals...thanks!!

midapita

This makes so much sense. So, just need to remember what radicals look like on a graph, and then you can deduce the domain.

zlcoolboy

wow, I've been struggling to understand domains all semester. Why did I not watch this video earlier????

DecayDollies

hello sir how about the f(x)= square of root - X - 2, is still greater than equal to zero? or less than to equal to zero?

JohnK-Alcon

Just out of curiosity, why didn't we do anything with the radical as you worked down? It seems to have disappeared. Does it have no part to play as we solve?

mattlopez

I have a question, how come you didn't flip the inequality sign when you divided the 2 on both sides? Aren't we supposed to switch the sign when we divide by both sides?

danieloc