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f(x) = 16000 + 50x + 0.2x^2

What happens if x = x+1 (increase by one)?

I believe it's something like this:

50(x + 1) + 0.2(x+1)^2 ->

50x + 50 + 0.2(x^2 + 2x1 + 1^2) ->

50x + 50 + 0.2x^2 + 0.2x + 0.2 ->

(I'm not sure about the next step because of my bad algebra skills): Possibly ->

50.2x + 50.2 + 0.2x^2

or

50x + 50.2 + 0.4x^2

Could anybody please help?

Thanks. :)