Movies in the 1990s followed a familiar pattern of producing classics in every genre, but with the added help of newer technology, computerised special effects and other new advances.
... the common denominator is 4a2. We get
<math>\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.</math>
Taking square roots of ...