An alternative method to solve a quadratic equation is to complete the square. To solve an equation of the form \(x^2 + bx + c = 0\) consider the expression \(\left(x + \frac{b}{2}\right)^2 + c\).

={4}\) we would have to square both sides of the equation to recover "\({P}=\)". This would give \({P}\) = 16. The same logic must also be applied when we are changing the subject of a formula.