Question 667867
h(x) = {{{4/(sqrt(x) - 13)}}}
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Denominator cannot be zero nor should there be a negative square root, so
Domain is all real numbers where
x > 0 and {{{x <> 169}}}
(0, 168) and (170, oo)
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{{{sqrt(x) - 13 = 0}}}
{{{sqrt(x) = 13}}}
{{{sqrt(x)^2 = 13^2}}}
{{{x = 13^2 = 169}}}
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