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This document defines key terms related to quadratic equations, complex numbers, and parabolas. It explains that a quadratic equation can be written in the form ax2 + bx + c = 0 and involves real numbers a, b, and c with a ≠ 0. It also defines the discriminant, complex numbers as a + bi, imaginary numbers as complex numbers with b ≠ 0, and the real and imaginary parts of complex numbers. Additionally, it states that the graph of a quadratic equation in two variables is called a parabola, and that the axis of symmetry of a parabola is its vertical or horizontal line through the vertex.

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Introductory Algebra
quadratic equation A quadratic equation is an equation that can be written in the form ax 2 + bx + c = 0, where a, b, and c are real numbers, with a 0.
discriminant The quantity under the radical in the quadratic formula, b 2 - 4ac.
complex number Any number that can be written in the form a + bi, where a and b are real numbers.
imaginary number A complex number a + bi with b  0.
real part The real part of a complex number a + bi is a.
imaginary part The imaginary part of the complex number a + bi is b.
standard form of a complex number The standard form of a complex number is a + bi.
conjugate of a complex number The conjugate of a complex number a + bi is a - bi.
parabola The graph of a second-degree (quadratic) equation in two variables is called a parabola.
parabola The graph of a second-degree (quadratic) equation in two variables is called a parabola.
axis (axis of symmetry) The axis of a parabola is the vertical or horizontal line through the vertex of the parabola.
quadratic function A function defined by an equation of the form f(x) = ax 2 + bx + c, for real numbers a, b, and c, with a 0.