The value root of 40 of lies between which two consecutive integers

When you square  +6  or  -6  you get  36.  That's less than  40.

When you square  +7  or  -7, you get  49.  That's more than  40.

So one of the square roots of  40  is between  +6  and  +7, and
the other square root of  40  is between  -7  and  -6 .

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