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    Defined Function Domain

    Lana defines a function $ f(x) $ which is given by the formula $$f(x) = x^2,$$ but only on a domain she has specified which consists of finitely many values $ x $; she leaves the function undefined for all other $ x $. Given that the range of $ f(x) $ is $ \{0,1,2,3,4,5,6,7,8,9\} $, what is the maximum number of points that could be in its domain?

    • 1
    • 2
    • 3
    • +
    • 4
    • 5
    • 6
    • -
    • 7
    • 8
    • 9
    • $\frac{a}{b}$
    • .
    • 0
    • =
    • %
    • $a^n$
    • $a^{\circ}$
    • $a_n$
    • $\sqrt{}$
    • $\sqrt[n]{}$
    • $\pi$
    • $\ln{}$
    • $\log$
    • $\theta$
    • $\sin{}$
    • $\cos{}$
    • $\tan{}$
    • $($
    • $)$
    • $[$
    • $]$
    • $\cap$
    • $\cup$
    • $,$
    • $\infty$

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