Decades: 90s BC - 80s BC - 70s BC - 60s BC - 50s BC - 40s BC - 30s BC - 20s BC - 10s BC - 0s BC - 0s
Years: 49 BC 48 BC 47 BC 46 BC 45 BC 44 BC 43 BC 42 BC 41 BC 40 BC
... 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 ...