U.S. Robotics was a company that made computer modems. It merged with and became a subsidiary of 3Com Corporation in June 1997. Today, 3Com makes modems and networking devices under the U.S. Robotics brand name.
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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 ...