Mark M. answered 05/31/21
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Retired math prof. Calc 1, 2 and AP Calculus tutoring experience.
I assume that you mean f(x) = (4x+2) / (x+4)
In that case, f(b+1) = [4(b+1)+2] / [b+1+4} = (4b+6) / (b+5)