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Rational Number

A number that can be written as a/b where a and b are integers, but b is not equal to 0.

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Natural Numbers

The set of numbers 1, 2, 3, 4, ... Also called counting numbers.

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Whole Numbers

All positive integers (including zero)

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Integers

whole numbers and their opposites

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irrational numbers

numbers that cannot be expressed in the form a/b, where a and b are integers and b =0.

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Percent Change

the percent a quantity increases or decreases from its original amount

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Ratio

a comparison of two numbers by division

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Compliment

Set of all elements in the universal set that are not in the set

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Intersection

the set of elements common to two or more sets

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union

a set containing all and only the members of two or more given sets

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Roster Form

form of writing a set in which you list the names of the members of the set between brackets

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Set Builder Notation

a shorthand used to write sets, often sets with infinite number of elements

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Linear Equation

An equation whose graph is a line.

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Point slope form

y-y1 = m(x-x1), where m is the slope and (x1,y1) is the point the line is passing through.

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Slope intercept form

y=mx+b

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Elimination method

solving systems by adding or subtracting equations to eliminate a variable

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Substitution method

A method of solving a system of equations in which one equation is solved for one variable in terms of the other

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Binomial

a polynomial with two terms

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standard form of a polynomial

terms are placed in descending order from largest degree to smallest degree

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Smiley face method

when you have to factor x(squared)+bx+c completely

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Factoring By Grouping

The use of the Distributive Property to factor some polynomials having four or more terms

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Perfect Square Trinomial

a trinomial whose factored form is the square of a binomial

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Discriminant

the expression under the radical in the quadratic formula b squared minus four a*c

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