## Encyclopedia > 492

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# 492

Years: 487 488 489 490 491 - 492 - 493 494 495 496 497

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 Quadratic formula ... 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 roots of both ...