Show that a quadratic form q(x) = * Ax of two variables is indefinite if (and only if) det A < 0. Here, A is a symmetric 2 x 2 matrix.

CHEM 112 Notes (1-13-16) Clicker Question: Calculate the molarity of a 12.0% sulfuric acid solution (2 SO4; 98.08 g/mol) having a density of 1.080 g/mL. = 12% H S2 4 MM=98.08 g/mol d=1.080 g/mol 12g H 2O (4er 100g of solution) 12 24 98.08 /= 0.122 24 100 ×1 1.080 = 92.59 = 0.09259 0.122 24= 1.32