Graph the piecewise function, use Desmos (paste your graph), or by hand (on the blank coordinate plane above)
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Substituting <em>x</em> = 0 directly gives the indeterminate form 0/0, so you can use l'Hopital's rule (and you'll have to do that twice):
The limand is continuous everywhere, so you can plug in <em>x</em> = 0 to get 36•1/2 = 18.