SOLUTION: The U.S. trade deficit in billions of dollars for the years 1997,1998,1999 can be computed by f(x)=16x^2-63,861x+63,722,378 Where X is the year. In which year was the trade defi

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: The U.S. trade deficit in billions of dollars for the years 1997,1998,1999 can be computed by f(x)=16x^2-63,861x+63,722,378 Where X is the year. In which year was the trade defi      Log On


   

Question 692037: The U.S. trade deficit in billions of dollars for the years 1997,1998,1999 can be computed by
f(x)=16x^2-63,861x+63,722,378
Where X is the year. In which year was the trade deficit 164 billion?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+f%28x%29+=+16x%5E2+-+63861x+%2B+63722378+
given:
+164+=+16x%5E2+-+63861x+%2B+63722378+
use quadratic formula
+x+=+%28+-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+

+x+=+%28+63861+%2B-+sqrt%28+%28-63861%29%5E2+-+4%2A16%2A63722378+%29%29+%2F+32+
My calculator can't handle these numbers. If you have a scientific
calculator, you should be able to solve for +x+