Asked by Babydoll2007
Explain why (-9)1/2 is not a real number but -9 1/2 is a real number.
Answers
Answered by
David
(-9)1/2 = -4.5 which is a real number.
Unless you're talking about square roots?
Unless you're talking about square roots?
Answered by
Babydoll2007
No I'm not talking about square roots.
Answered by
Steve
If you are talking about powers,
9^(1/2) = 3
x^(1/2) = √x so you are talking about square roots.
(-9)^(1/2) is not real, because negative numbers do not have real square roots.
That is because if x = √(-9) then x^2 = -9. But all numbers are positive when squared.
9^(1/2) = 3
x^(1/2) = √x so you are talking about square roots.
(-9)^(1/2) is not real, because negative numbers do not have real square roots.
That is because if x = √(-9) then x^2 = -9. But all numbers are positive when squared.
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