# Example 3 - Chapter 12 Class 7 Algebraic Expressions

Last updated at Dec. 6, 2021 by Teachoo

Last updated at Dec. 6, 2021 by Teachoo

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₯, β21x 15π₯, β21π₯ 15π₯ has variable π₯ β21π₯ has variable π₯ 15π₯ and β21π₯ 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) β 4ab, 7ba β4ab, 7ba β4ab has variable ab 7ba has variable ba i.e. ab (β΅ ba = ab) Hence, β4ab 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, β 4pq2 pq2, β 4pq2 pq2 has variable pq2 β4pq2 has variable pq2 Since pq2 and β4pq2 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.