Question

what is elvaulating expressions

Answer 1

do you have an example?

Answer 2

To evaluate means to give a numerical equivalent tp the expression.
For exam[le the VALUE of 3x if x = 4 is 3 x 4 = 12

For the above example 729 is the value - the result of evaluation.
3x3x3x3x3x3 is an expression of the power as a product, sometimes called "expanded form."
3 to the power of 6 is a word description of the power.

An evaluation of an expression is a simple number.