Simplify the following expressions and determine if terms are like or unlike: a) 2ab and 2ab2 b) 4xy and -9xy Simplify: (3a)2 + 7a(5a - 12b) 7k + 4m2 - 2k + 10m2 (2x - 1)(2x - 4)

QUESTION 4

4.1 Are these like or unlike terms?

a) $2ab$ and $2ab^2$
These are unlike terms because the powers of the variable $b$ are different ($b^1$ vs $b^2$).

b) $4xy$ and $-9xy$
These are like terms because they have the exact same variables ($x$ and $y$) raised to the same powers ($x^1y^1$).

4.2 Simplify the following expressions:

4.2.1 $(3a)^2 + 7a(5a - 12b)$