Solving Algebraic Expressions

Front

What is a variable in an algebraic expression?

Back

A variable is a symbol, often a letter, that represents an unknown number in an expression.

Front

What does the expression 3 - 7 - 4n + 9n simplify to?

Back

The expression simplifies to 3 - 7 + 5n.

Front

What is the value of 'n' in the expression 3 - 7 - 4n + 9n?

Back

The variable is 'n'.

Front

How do you evaluate the expression 5(10-a) when a=6?

Back

Substituting a=6 gives 5(10-6) = 5(4) = 20.

Front

What is the result of the expression 2(a+3) when a=4?

Back

Substituting a=4 gives 2(4+3) = 2(7) = 14.

Front

How do you evaluate 3f + 5 when f=8?

Back

Substituting f=8 gives 3(8) + 5 = 24 + 5 = 29.

Front

What is the value of the expression 5c + 7k when c=2 and k=7?

Back

Substituting c=2 and k=7 gives 5(2) + 7(7) = 10 + 49 = 59.

Front

What is an algebraic expression?

Back

An algebraic expression is a mathematical phrase that includes numbers, variables, and operation symbols.

Front

What does it mean to evaluate an expression?

Back

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

Front

What is the order of operations in mathematics?

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.