Question 114640
If {{{f(x)=x^2-4}}} and{{{g(x)= sqrt(x+4)}}} find (fog)(x)

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fog(x) = f[g(x)] = f[sqrt(x+4)]

= [sqrt(x+4)]^2-4 

= (x+4) - 4 

= x
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Cheers,
Stan H.