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2^x = a
maka :
f(x) menjadi : a² + 2a - 3
g(x) menjadi a + 3
maka :
f(x) / g(x)
= (a² + 2a - 3) / (a+ 3)
= (a +3) (a - 1) / (a + 3)
= a - 1
ganti nilai a seperti semula
= 2^x - 1