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  1. Chapter 12 Class 7 Algebraic Expressions
  2. Serial order wise

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) 15๐‘ฅ, โ€“21x 15๐‘ฅ, โ€“21๐‘ฅ 15๐‘ฅ has variable ๐‘ฅ โˆ’21๐‘ฅ has variable ๐‘ฅ 15๐‘ฅ and โˆ’21๐‘ฅ have some variable ๐‘ฅ 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 โˆ’4ab, 7ba โˆ’4ab has variable ab 7ba has variable ba i.e. ab (โˆต ba = ab) Hence, โˆ’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 3๐‘ฅy, 3๐‘ฅ 3๐‘ฅy has variable xy 3๐‘ฅ has variable y Since 3๐‘ฅy and 3๐‘ฅ 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) 6๐‘ฅy2, 9x2y 6๐‘ฅy2, 9x2y 6๐‘ฅy2 has variable xy2 9x2y has variable ๐‘ฅ2y Since 6๐‘ฅy2 and 9๐‘ฅy2 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 โˆ’4pq2 has variable pq2 Since pq2 and โˆ’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.

About the Author

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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.