Confused!

You can model the population of a certain city between the years 1955 and 2000 by the radical function P(x)= 55,000 √x - 1945 . Using this model, in what year was the population of that city 275,000?

A) 1970
B)1966
C)1964
D)1975

Question

Confused!

You can model the population of a certain city between the years 1955 and 2000 by the radical function P(x)= 55,000 √x - 1945 . Using this model, in what year was the population of that city 275,000?

A) 1970
B)1966
C)1964
D)1975

anonymous · Answer

Yeah I squared both sides and came up with: p(x)=275,000 so 275,000=5500*sqrt(x-1945) or sqrt(x-1945)=275000/55000

zepdrix · Answer

Oh the 1945 is under the square root? I wish you had corrected me before I did all those steps.... :\

anonymous · Answer

Oh Im sorry, I didnt catch that at first

anonymous · Answer

I think the answer may be A. 1970 ??

anonymous · Answer

If you work the steps backwards, the answer ends up being A. Just use reverse BEDMAS