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 Question: What is an Operation ? Answer: An operation is a procedure which produces a new value from one or more input values. +, - , x, are symbols which represent the arithmetic operations of adding, subtracting, multiplying and so on. In general, an operation is a rule for determining the new element from one or more elements. Some e.g. of mathematical operations are shown below : For example, the principal square root of 9 is 3, denoted √9 = 3, because 32 = 3 x 3 = 9. If otherwise unqualified, the square root of a number refers to the principal square root: the square root of 2 is approximately 1.4142 Plus sign + means that two numbers are added together. For example, in the picture on the right, there are 3 + 2 apples - meaning three apples and two other apples - which is the same as five apples, since 3 + 2 = 5 In mathematics, it is often useful to view or even define subtraction as a kind of addition, the addition of the opposite. We can view 7 - 3 = 4 as the sum of two terms : Multiplication is written using the multiplication sign x between the terms, that is, in infix notation. The result is expressed with an equals sign. For example, 2 x 3 = 6 (verbally, two times three equals six)