Pre Calculus question (inverse functions)

Question

Statistical models predict that the price (in dollars) of a 500 GB hard drive will change according to the function p(t) = 600 − 2t2, where t is the month. Which expression gives the number of months t (passed since January 1) in terms of the price p?

Answer 1

p = 600 - 2t²

 

2t² = 600 - p 

 

  t² = (600 - p)/2

 

  t = [(600 - p)/2]^½