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g(x) = x + 1
suma:
f(x) + g(x)
= 1/(x - 2) + x + 1
= (1 + (x+1)(x-2))/(x - 2)
= (1 + x^2 - 2x + x - 2)/(x - 2)
=(x^2 - x - 1)/(x - 2)
resta:
f(x) - g(x)
= 1/(x - 2) - (x + 1)
= (1 - (x + 1)(x - 2))/(x - 2)
= (1 - x^2 + 2x - x + 2)/(x - 2)
= (3 - x^2 -x )/(x - 2)
multiplicación:
f(x)g(x)
= (1/(x - 2))(x + 1)
= (x + 1)/(x - 2)
división:
f(x)/g(x)
= (1/(x - 2))/(x + 1)
= 1/((x - 2)(x + 1))
= 1/(x^2 + x - 2x - 2)
= 1/(x^2 - x - 2)
composición:
f(x)*g(x)
= 1/((x + 1) - 2)
1/(x - 1)