Question

Decide if the expressions in each pair are equivalent. Explain how you know.

x+x+x+x and 4x
5x and x+5

Answer 1

x+x+x+x = 4x

5x ≠ x+5

Explanation:

x+x+x+x, there are 4 x's, which means they equal to 4x

5x means there are 5 x's, so 5x = x+x+x+x+x, not x+5.