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Constants and VariablesCovid19 has led the world to go through a phenomenal transition . Elearning is the future today. Stay Home , Stay Safe and keep learning!!! Constants and Variables : Constants are fixed number and variables are literals.The diameter, d of a circle of radius r is given by the formula d = 2r. In this formula, 2 is a fixed number whereas the literal numbers d and r are not fixed because they depend upon the size of the circle. For circles of different sizes, the values of d and r will be different. It follows from the above examples that in Algebra, we come across two types of symbols namely constants and variables as defined below. Constant : A symbol having a fixed numerical value is called a constant. OR The number before an alphabet (variable) is called a constant. Variable : A symbol which takes various numerical values is called a variable. OR The alphabet after a number (constant) is called a variable. In the formulas d = 2r; 2 is a constant whereas, r and d are variables. Note: In some situations, literal numbers are also treated as constants. In such situations, it is presumed that the particular literal number will take a few fixed values. Examples : Identify the constants and the variables in each of the following : i) 8a Solution : Constant = 8 ; Variable = a ii) 3d Solution : Constant = 3 ; Variable = d iii) 4t Solution : Constant = 4 ; Variable = t iv) ab Solution : Constant = 0 ; Variable = ab v) 44 Solution : Constant = 44 ; Variable = none vi) 21ac Solution : Constant = 21 ; Variable = a and c vii) 13r Solution : Constant = 13 ; Variable = r viii) 23s Solution : Constant = 23 ; Variable = s ix) 3 rd Solution : Constant = 3 ; Variable = r and d x) 24 th Solution : Constant = 24 ; Variable = t and h Introduction to Algebra • Addition of Literals • Subtraction of Literals • Multiplication of Literals • Division of Literals • Constants and Variables • Coefficient Covid19 has affected physical interactions between people. Don't let it affect your learning.
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