Barbara Pierce Bush (born November 25, 1981) is the daughter of President George W. Bush and twin sister of Jenna Bush. (See Barbara and Jenna Bush.)
... getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect square; it is the square of (x + ...