What is the domain of $f(x) = sqrt(x^2-144)$ ?

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Answer 1 · 2018-05-18T22:30:34

$x >= 12 and x <= -12$

$x^2 - 144 >=0$ or the value under the radical in imaginary:

$x^2 >=144$

$x >= +-sqrt144$

$x >= +-12$

$x >= 12 and x <= -12$

What is the domain of f(x) = sqrt(x^2-144)f(x) = sqrt(x^2-144)?