**TI83F* AppVariable file 03/21/07, 14:36 GLA205  nav 26CE319875DD4F1B9DFDCB650E5220B1GLA205.GLA2051  complex number~complex number:Any number that can be written in the forma + bi, where a and b are real numbers and i is the imaginary unit. constant2constant:A term that does not contain a variable.  discriminantYdiscriminant:In the Quadratic Formula, the expression under the radical sign, b^2 - 4ac. imaginary unit6imaginary unit:i, or the principal square root of -1.  linear termJlinear term:In the equation f(x) = ax^2 + bx + c, bx is the linear term. parabola!,parabola:The graph of a quadratic function. pure imaginary numberHpure imaginary number:The complex number a + bi when a = 0 and b  0. quadratic equationLquadratic 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.  quadratic inequalityquadratic inequality:An inequality of the form y > ax^2 + bx + c, y < ax^2 + bx + c, y  ax^2 + bx + c, y  ax^2 + bx + c, where a  0.  quadratic termRquadratic term:In the equation f(x) = ax^2 + bx + c, ax^2 is the quadratic term.  root+root:The solution of a quadratic equation.  square rootsquare root:One of the two equal factors of a number. If a^2 = b, then a is the square root of b.Example: 12 is a square root of 144 since 12^2 = 144.  vertex formvertex form:A quadratic function in the form y = a(x - h)^2 + k, where (h, k) is the vertex of the parabola and x = h is its axis of symmetry. 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!  @@@@@@@@      % % % @@@@@@   ä