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Dik : f(x) = [2x + 1] / x dan (f o g)(x) = x - 2
Dit : g(- 3)
Jaw:
Step-1
Mencari g(x)
f(g(x)) = x - 2 ⇒ substitusi g(x) ke dalam f(x)
[2.g(x) + 1] / g(x) = x - 2
2.g(x) + 1 = x.g(x) - 2.g(x)
4.g(x) - x.g(x) = - 1
g(x).[4 - x] = - 1
Diperoleh g(x) = - 1 / [4 - x], atau dapat ditulis menjadi g(x) = 1 / [x - 4]
LATEX:
Step-2
Mencari g(3)
g(3) = 1 / [3 - 4]
Hasilnya g(3) = - 1
LATEX:
___ selesai ___