This is a picture of a 1946 Luscombe Model 8A aircraft. It is serial number 3410, registered in the USA as N71983.
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... 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 bo ...