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Algebra Level 2

If f f is a function having codomain the real numbers such that f ( x ) = x 2 − 1 f(x) = \sqrt{x^2 - 1} for all x x in its domain, what is the largest possible domain of f f ?

( − ∞ , − 1 ] ∪ [ 1 , ∞ ) (-\infty, -1] \cup [1, \infty) ( − ∞ , ∞ ) (-\infty, \infty) ( − ∞ , − 1 ] ∪ [ − 1 , ∞ ) (-\infty, -1] \cup [-1, \infty) None of these [ − 2 , 2 ] [-2, 2]

Iqrar Nofi by Iqrar Nofi , 26, Pakistan

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1 solution

Iqrar Nofi
Jul 31, 2015

[-∞,-1]∪[1,∞] It is a simple answer

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