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# 450s

Decades: 400s - 410s - 420s - 430s - 440s - 450s - 460s - 470s - 480s - 490s - 500s

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 Quadratic formula ... fraction; the common denominator is 4a2. We get $\left(x+\frac{b}{2a}\right)^2=\frac{-4ac+b^2}{4a^2}=\frac{b^2-4ac}{4a^2}.$ Taking square ...