1927 - The "Bureau of Chemistry" is reorganized into two separate entities. Regulatory functions are located in the "Food, Drug, and Insecticide Administration", and nonregulatory research is located in the "Bureau of Chemistry and Soils".
1930 - The name of the "Food, Drug, and Insecticide Administration" is shortened to "Food and Drug Administration" (FDA) under an agricultural appropriations act.
... "=", 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 we add the square of b/(2a) to ...