# Example 3 - Chapter 12 Class 7 Algebraic Expressions

Last updated at Dec. 21, 2018 by Teachoo

Last updated at Dec. 21, 2018 by Teachoo

Transcript

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) 15๐ฅ, โ21x 15๐ฅ, โ21๐ฅ 15๐ฅ has variable ๐ฅ โ21๐ฅ has variable ๐ฅ 15๐ฅ and โ21๐ฅ have some variable ๐ฅ 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) โ 4ab, 7ba โ4ab, 7ba โ4ab has variable ab 7ba has variable ba i.e. ab (โต ba = ab) Hence, โ4ab 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 3๐ฅy, 3๐ฅ 3๐ฅy has variable xy 3๐ฅ has variable y Since 3๐ฅy and 3๐ฅ 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) 6๐ฅy2, 9x2y 6๐ฅy2, 9x2y 6๐ฅy2 has variable xy2 9x2y has variable ๐ฅ2y Since 6๐ฅy2 and 9๐ฅy2 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, โ 4pq2 pq2, โ 4pq2 pq2 has variable pq2 โ4pq2 has variable pq2 Since pq2 and โ4pq2 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

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.