Ex 12.1

Chapter 12 Class 7 Algebraic Expressions
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Ex 12.1, 6 State whether a given pair of terms is of like or unlike terms. (i) 1, 100 1, 100 Since 1 and 100 have no variable. ∴ They are like terms Ex 12.1, 6 State whether a given pair of terms is of like or unlike terms. (ii) –7x, 5/2x –7x, 5/2 𝑥 −7x has variable 𝑥 5/2 𝑥 has variable 𝑥 −7𝑥 and 5/2 𝑥 have same variable x ∴ They are like terms. Ex 12.1, 6 State whether a given pair of terms is of like or unlike terms. (iii) –29x, –29y –29x, –29y –29x has variable x –29y has variable y –29x and –29y have different variables ∴ They are unlike terms. Ex 12.1, 6 State whether a given pair of terms is of like or unlike terms. (iv) 14xy, 42yx 14xy, 42yx 14xy has variable xy 42yx has variable yx i.e. xy(∴ yx = xy) So, 14xy and 42yx have same variable xy ∴ They are like terms Ex 12.1, 6 State whether a given pair of terms is of like or unlike terms. (v) 4m2p, 4mp2 4m2p, 4mp2 4m2p has variable m2p 4mp2 has variable mp2 4m2p and 4mp2 have different variables ∴ They are unlike terms. Ex 12.1, 6 State whether a given pair of terms is of like or unlike terms. (vi) 12xz, 12x2z2 12xz, 12x2z2 12xz has variable xz 12x2z2 has variable x2z2 12xz and 12x2z2 have different variables ∴ They are unlike terms.