You guess the answer first, then you compute the difference and use that to adjust your estimate ... For example, suppose you wanted to take the square root of 85. You can observe that 9 squared ...

right)^2 - c\) which can then be solved by taking the square root of both sides ... the squares in the form of \(ax^2 + bx + c = 0\): use \(\left(x + \frac{b}{2}\right)^2 - \left(\frac{b}{ ...