In General they allow us to perform Operation.
Expression: an combination of values, variable, Operator and functions that evaluates to a single value.
e.g.
Expression can be simple like(2+3)
More complex like(2*x) + (3*y)
Note: To get a square of a number we need to **. e.g. 2**2= 4
Order of operations:
In expression and equation, the order in which operations are performed is important, as it is defined by a hierarchy of operators:
1- Paranthesis
2- exponential
3- multiplication and division(performed left to right)
4- addition and subtraction(performed left to right)
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