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Algebra 1 Chapter 9

McDougal Littell

Square Root I b sqaured=a then b is a square root of a.
Positive Square Root One of two square roots of a positive number.
Negative Square Root Any of the numbers less than zero.
Radicand The number or expression inside a radical symbol.
Perfect Square A number whose square roots are integers or quotients of integers.
Irrational Number A number that cannot be written as the quotient of two integers.
Radical Expression
Quadratic equation in standard form
Leading coefficent The coefficient of the first term in a polynomial written in
Simplest form of a radical expression An expression that has no perfect square factors other than 1 in the radicand, no fractions in the radicand, and no radicals appearing in the denominator of a fraction.
Quadratic Function in Standard Form A function written in the form y=ax2+bx+c
Parabola The u-shaped graph of a quadratic function.
Vertex The lowest point of a parabola that opens up or the highest point of a parabola that opens down.
Axis of symmetry The line passing through the vertex that divides the parabola into two symmetric parts.
Roots The solutions of ax2+bx+c=0
Quadratic Formula
Discriminant The formula used to find the solutions of the quadratic equation.
Quadratic Innequalites
Graph of a quadratic Inequality
Created by: dhmahlman