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Example 3 - State with reasons, which  pairs of terms are of like and

Example 3 - Chapter 12 Class 7 Algebraic Expressions - Part 2
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Example 3 State with reasons, which of the following pairs of terms are of like terms and which are of unlike terms: (i) 7x, 12y 7x, 12y 7x has variable x 12y has variable y 7x and 12y have different variables So they are unlike terms Example 3 State with reasons, which of the following pairs of terms are of like terms and which are of unlike terms: (ii) 15π‘₯, –21x 15π‘₯, –21π‘₯ 15π‘₯ has variable π‘₯ βˆ’21π‘₯ has variable π‘₯ 15π‘₯ and βˆ’21π‘₯ have some variable π‘₯ So, they are like terms Example 3 State with reasons, which of the following pairs of terms are of like terms and which are of unlike terms: (iii) – 4ab, 7ba βˆ’4ab, 7ba βˆ’4ab has variable ab 7ba has variable ba i.e. ab (∡ ba = ab) Hence, βˆ’4ab and 7ba have some variable ab So, they are like terms Example 3 State with reasons, which of the following pairs of terms are of like terms and which are of unlike terms: (iv) 3xy, 3x 3π‘₯y, 3π‘₯ 3π‘₯y has variable xy 3π‘₯ has variable y Since 3π‘₯y and 3π‘₯ have different variables. So, they are unlike terms. Example 3 State with reasons, which of the following pairs of terms are of like terms and which are of unlike terms: (v) 6π‘₯y2, 9x2y 6π‘₯y2, 9x2y 6π‘₯y2 has variable xy2 9x2y has variable π‘₯2y Since 6π‘₯y2 and 9π‘₯y2 have different variables So, they are unlike terms. Example 3 State with reasons, which of the following pairs of terms are of like terms and which are of unlike terms: (vi) pq2, – 4pq2 pq2, – 4pq2 pq2 has variable pq2 βˆ’4pq2 has variable pq2 Since pq2 and βˆ’4pq2 have same variable pq2 So, they are like terms. Example 3 State with reasons, which of the following pairs of terms are of like terms and which are of unlike terms: (vii) mn2, 10mn mn2, 10mn mn2 has variable mn2 10mm has variable mn Since mn2 and 10mm have different variables So, they are unlike terms.

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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.