Now, B by A if B by A is negative, we will found out that this negative square of course, this is a positive number minus, whatever this number is negative number, so this can be actually smaller than B by A or larger see now we have got C by A to be positive. So, therefore obviously, B by A square minus see we have said that C by A is positive now if this is negative number. So, negative square this is positive number obviously, and this one, so again the same criteria will come, because this term will become more than B by A plus epsilon, because you see when you take a negative square becomes positive number.