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NACA

The National Advisory Council for Aeronautics (NACA) was a US agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved to be replaced by NASA.

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Quadratic formula

... the expression to the left of "=", that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so ...