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To write a rule for g, substitute ( 12x) for x into f.
g(x)=sqrt(1/2x)
f(x)=sqrt(x), g(x)=f(1/2x) To do so, we will substitute ( 12x) for x into f. g(x)=f( 1/2x) ⇓ g(x)=sqrt(1/2x)