"Evaluate the expression" means replace all the letters with their numerical
values, and then see what number the whole expression works out to be.
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Rather, of an expression.
Evaluating the expression is usually used in math, and it means solve the question.
meaning to evaluate the variable in an expression. An algebraic expression is also a problem that contains no equals sign and you don't solve it, rather you simplify it.It means to solve something.
Find the value of the expression.
It depends on what you mean by solve: simplify, evaluate or rationalise the denominator. The answer will also depend on the radical expression.