At the 5:12 mark of the video, the instructor states the domain of the square root of x to be zero to infinity. His curved bracket does not include zero, but zero is in the domain of the function.He made similar mistakes in two other places. He should have included 1 in the range of y=x^2 +1, and he should have included zero in the range of the square root of x.
How to determine the domain and range of three graphs
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