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complex number any number that can be written as a+bi, where a and b are real numbers and i =√-1 imaginary number the square root of a negative number, written in the form bi, where b is a real number and i is the imaginary unit, √-1 imaginary unit the unit in the imaginary number system, √-1 complex conjugate for any complex number a + bi imaginary part for a complex number of the form a+bi, the real number b real part for a complex number of the form a+bi, the real number a discriminant b2 - 4ac in ax^2+bx+c completing the square a process used to form a perfect-square trinomial zero of a function for the function f, any number x such that f(x)=0 Quadratic Formula -b ±√b^2 - 4ac −−−−−−−−−−− 2a