Find the number that we can place in the box, so that the resulting quadratic is the square of a binomial.
\[x^2 + \dfrac{4}{5}x + \boxed{\phantom{000}}\]

Well in order to lose a pound you would have to burn 1,500 calories. the more calories you burn the more weight you lose. in order to lose 2 pounds you would have to run 4 hours and 28 minutes.