Suppose we are given

  2x − 3

Let’s find its value for different value of x

 

For x = 1

2x − 3

     = 2 × 1 − 3

      = 2 − 3

      = −1

 

For x = 2

2x −3

      = 2 × 2 − 3

      = 4 − 3

      = 1

 

For x = 0

2x − 3

      = 2 × 0 − 3

      = 0 − 3

      = −3

Similarly

For 10x2 − 10x + 10

 

For x = 1

10x2 − 10x + 10

         = 10(1)2 − 10 (1) + 10

         = 10 − 10 + 10

         = 10

 

For x = 2

10x2 − 10x + 10

  = 10(2)2 − 10(2) + 10

  = 10 × 4 − 10 × 2 + 10

  = 40 − 20 + 10

  = 20 + 10

          = 30

 

 

  1. Chapter 12 Class 7 Algebraic Expressions
  2. Concept wise

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.