An expression is a set of
variables,
numbers,
operators,
parenthesis
and
functions
without any
equal sign
or
inequalities
that has mathematical meaning. Examples of expressions include:
5x+2
x^{2}-2x+3
(a+3)(a-3)
Examples of mathematical formulas that are not an expression are:
t = 4
0 = x^{2}-4x+2
x+5 ≤ 37
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