He observed solar system objects, and after observing Mars he named the "seas" and "continents", including the canali, famously mistranslated as "canals".
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... 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 ...