**TI83F* AppVariable file 03/21/07, 14:28 r GLA109r p nav 868E89BEB1644A6EA4327E33887122BEGLA109. GLA1091   discriminantYdiscriminant:In the Quadratic Formula, the expression under the radical sign, b^2 - 4ac. exponential decay^exponential decay:Exponential decay occurs when a quantity decreases exponentially over time. exponential functionqexponential function:A function that can be described by an equation of the form y = a^x, where a > 0 and a  1. exponential growth`exponential growth:Exponential growth occurs when a quantity increases exponentially over time. maximummaximum:The highest point or the critical point on the graph of a curve where the curve changes from an increasing curve to a decreasing curve. minimum2minimum:The lowest point on the graph of a curve. parabola!,parabola:The graph of a quadratic function. quadratic equationKquadratic equation:An equation of the form ax^2 + bx + c = 0, where a  0.  Quadratic FormulaQuadratic Formula:The solutions of a quadratic equation in the form ax^2 + bx + c = 0, where a  0, are given by the formula x = (-b +/- (b^2 - 4ac)) / (2a).  quadratic functionfquadratic function:A function described by an equation of the form f(x) = ax^2 + bx + c, where a  0.  root+root:The solution of a quadratic equation.  symmetrysymmetry:A geometric property of a figure in which it can be folded so that each half matches the other exactly or rotated about a point less than 360 so that the final image matches the original figure.  vertex of a parabolaAvertex of a parabola:The maximum or minimum point of a parabola. zeros1zeros:The roots, or x-intercepts, of a function.8`! #p!  @@@@@@@@      % % % @@@@@@   a