An expression is a collection of mathematical terms, connected by mathematical binary operations (such as +, - , * , /).
An inequality is a comparison between two expressions.
For example,
x2 + 3x/4y - 2xy + 7 and
3x + sin(x)*ex - 29/x + sqrt(x+y3) - 4y/27, where x is not 0
are expressions in two variables, x and y.
x2 + y < 4x is an inequality
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simply put, an expression has no "equal to" sign (=). and equation has the "equal" to sign and and inequality has either one of these signs <, >
What is the difference between evaluating an expression?
NOTHING
Expression has no answer. a equation has an answer
5x20 is not an inequality, it is an expression.