Question

write an equivalent expression with the fewest possible terms. first, write subtraction as adding the opposite. $3a + 1b - 2a + 4b = 3a + 1b + \square + 4b$

Explanation:

Step1: Rewrite subtraction as addition

The term $-2a$ is equivalent to $+(-2a)$.

Step2: Fill in the blank

Substitute the rewritten term into the expression.

Answer:

$-2a$