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For 21
book gives answer:
but the function at x = 2 becomes
so shouldn't point 2 be included in the domain?
For 23
book gives answer:
but here also at x=2 function is defined
i think in both questions point 2 should be included ... just need confirmation or reason why it is not included?
Hello, cupid!
I don't understand their answers.
First, note that: .
The radicand must be positive.
. . [1] The numerator and denominator are both positive, or
. . [2] The numerator and denominator are both negative.
Case [1]
. . Hence: .
Case [2]
. . Hence: .