It means a value that isn't a variable.
For example, "X" is a variable, since its value can vary.
Now, the number "33" is a constant, because its value is constant, or unchanging.
(If 33 were to become 34, it wouldn't be 33 anymore.)
(If x's value were to change from 5 to 8, it's still x, but its value varied.)
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In a mathematical equation, the constant is defined as a term in the equation that only includes a real number. Since a negative number is a real number, then yes, a negative number can be considered a constant. For example, in the equation 6x -2... -2 would be the constant because it is a term that contains only the real number (-2).
It is a constant.
2x = 2x + 0 Hence the constant term is 0 (zero)
It means "a Mathematical Expression".
Quadrilateral is a mathematical term used for any figure with its area bounded by four straight line segments forming a closed path.