Yakovlev Design Bureau: Russian aircraft designer.
Alexander Sergeevich Yakovlev, the founder of the Yakovlev design bureau
SOKOL Aircraft Building Plant[?]
Yak Aircrafts
... common 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 ...