Mr. seow borrowed a certain amount from a bank which charged him an interest of 3.5% per year .if he owed the bank $4347 at the end of the year, how much did he borrow from the bank

The amount owed is
  owed = principal + 0.035*principal = principal*(1 + 0.035)

Then the principal amount borrowed is
  principal = owed/1.035 = $4347/1.035 = $4200

Mr. Seow borrowed $4200 from the bank.

Do you need with the x value for the minimum? its always between the two intercepts for a parabola