# 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.

About the Author

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.