Check sibling questions

Example 9 - Find the value of the expressions for a = 3, b = 2 (i) a+b

Example 9 - Chapter 12 Class 7 Algebraic Expressions - Part 2
Example 9 - Chapter 12 Class 7 Algebraic Expressions - Part 3 Example 9 - Chapter 12 Class 7 Algebraic Expressions - Part 4

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Transcript

Example 9 Find the value of the following expressions for a = 3, b = 2. (i) a + b a + b Putting a = 3 , b = 2 = 3 + 2 = 5 Example 9 Find the value of the following expressions for a = 3, b = 2. (ii) 7a – 4b 7a – 4b Putting a = 3, b = 2 = 7(3) − 4(2) = 21 − 8 = 13 Example 9 Find the value of the following expressions for a = 3, b = 2. (iii) a2 + 2ab + b2 a2 + 2ab + b2 Putting a = 3, b = 2 = (3)3 − (2)3 = (3) − 2 (3) (2) + (2)2 = 21 + 4 = 25 Example 9 Find the value of the following expressions for a = 3, b = 2. (iv) a3 – b3 a3 – b3 Putting a = 3, b = 2 = (3)3 − (2)3 = (3 × 3 × 3) − (2 × 2 × 2) = 27 − 8 = 19

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.