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Evaluate polynomial over extension ring

Given a ring and polynomial like: _.<I> = RR[] K.<i> = RR.extension(I^2 + 1) L.<a, b> = K[] f = a + i*b then I would expect that f(i=0) would give me a. But instead it just returns the same value again.

Any ideas how to do this? Thanks

Evaluate polynomial over extension ring

Given a ring and polynomial ~~like:~~ like:

 _.<I> = RR[]
K.<i> = RR.extension(I^2 + 1)
L.<a, b> = K[]
f = a + i*b

then I would expect that f(i=0) would give me a. But instead it just returns the same value again.

Any ideas how to do this? Thanks