Evaluating Expressions

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with given numbers.

Front

Evaluate the expression: x^2 - xy when x = 8 and y = -3.

Back

88

Front

Evaluate the expression: bc + 5a when a = 3, b = 4, and c = -6.

Back

-9

Front

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

Back

22

Front

Evaluate the expression: -7w^2 + 2w when w = -4.

Back

-120

Front

What is the value of x in the expression: 3x + 4 when x = -2?

Back

-2

Front

What is a variable in an expression?

Back

A variable is a symbol (usually a letter) that represents an unknown value in an expression.

Front

What is a coefficient in an expression?

Back

A coefficient is a numerical factor that multiplies a variable in an expression.

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that determines the sequence in which calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).