Algebra Cheatsheet

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Real Numbers

Term

Definition

Example

CommutativityStates that changing the order of the operands doesn't change the result. a+b=b+a a×b=b×a
AssociativityStates that the way the parentheses are placed doesn't change the result of the operation.(a+b)+c=a+(b+c) (a×b)×c=a×(b×c)
Distributive LawStates that multiplication distributes over addition, and addition distributes over multiplication.a×(b+c)=(a×b)+(a×c)
Whole NumbersThe set of positive, non-fractional numbers including zero.W={0,1,2,3,}
IntegersA set of numbers that includes whole numbers as well as their negatives.Z={,3,2,1,0,1,2,3,}
Rational NumbersNumbers that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.12,5,6.25
Irrational NumbersNumbers that cannot be expressed as a fraction of two integers, meaning they cannot be represented as terminating or repeating decimals. 2,π
PEMDASAn acronym that stands for Parenthesis, Exponents, Multiplication, Division, Addition, and Subtraction. It describes the order of operations in an algebraic expression. Division and multiplication have the same priority and are evaluated from left to right.
Absolute ValueThe distance of a number from zero. The absolute value of a number x is represented as x.|10|=10 |10|=10

Exponents

Radicals

Equations

Factoring Techniques

Systems of Equations

Inequalities

Functions