New South Wales contains 549 separate Protected Areas with a total land area of 4,953,271 hectares (6.18% of the state’s area). 150 of these are National parks, totalling 4,172,308 hectares (5.21% of the state’s area).
... 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 both sides ...