Jawabanmu

2014-03-18T20:53:57+07:00
1. f(x) = x² + 4
g(y) =  \frac{2}{ \sqrt y}
x =  \frac{2}{ \sqrt y}
x \sqrt{y} = 2
 \sqrt{y} =  \frac{2}{x}
y =  \frac{4}{ x^{2} }
g(x) =  \frac{4}{ x^{2} }

(gof) x = g(f(x))
=  \frac{4}{ (x^{2}+4){2}  }
=  \frac{4}{ x^{4}+8 x^{2} +16 }
(gof)(t)= \frac{4}{ t^{4}+8 t^{2}+16  }
mungkin begitu sih no 1