At the 1:50 mark, he finds the domain by finding when the radical expression is greater than or equal to zero. He should have found when the expression UNDER the radical is greater than equal to zero. He still ended up with the correct domain.
Finding the quotient and domain of two functions
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Questions answered by this video:
How do I find the quotient of two functions?
How do I find the domain for the quotient of two funtions?
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The instructor gives an example of finding the quotient of two functions and then finding the domain of this quotient. The denominator in his example is a radical expression.