Question

Mr. Lindsay wrote the four expressions below on the board

Answer 1

The two equivalent expressions are 1 and 4
Let's substitute 2 for x

Expression 1
9 + 5(2) - 5 + 3(2) =
9 + 10 - 5 + 6 = 20
Expression 4
4(1 + 2(2)) =
4(1 + 4) =
4(5) = 20

When you substitute 2 for x in expression 1 and 4 you get the same answer of 20.