Algebra: Variables and Expressions

Front

What is a variable in algebra?

Back

A variable is a symbol, often a letter, that represents a number that can change or vary.

Front

What is an expression in algebra?

Back

An expression is a combination of numbers, variables, and operations (like addition and multiplication) that represents a value.

Front

Evaluate the expression: 2r + 1 if r = 3

Back

7

Front

Evaluate the expression: 4h + 2g + 4 when g = 3 and h = 9

Back

46

Front

What does b^2 represent when b = 3?

Back

b^2 represents 3^2, which equals 9.

Front

Evaluate the expression: b^2 + 4 when b = 3

Back

13

Front

Evaluate the expression: 3x + 8 if x = 2

Back

14

Front

Evaluate the expression: 2(a - 5) + 2 when a = 15

Back

22

Front

What is the order of operations in algebra?

Back

The order of operations is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right), often abbreviated as PEMDAS.

Front

What is the difference between an equation and an expression?

Back

An equation states that two expressions are equal, while an expression does not include an equality sign.