sr8bElleh3lsi sr8bElleh3lsi

04-11-2016
Mathematics

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What's the domain of square root of (x^2-81)

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Nirina7 Nirina7

09-11-2016

the domain of this function is x^2-81>=0, it means (x-9) (x+9)>=0, so
x>=-9 or x>=9, D= ]- infinity, -9]U[9, + infinity[

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