Zach’s mistake in this problem is that he didn’t multiply the 2 outside of the parenthesis by -4. Another mistake made was his final expression. Instead of “4 + -1,” the problem would be “4 - 1.”
Solving Zach’s equation correctly would look like:
3 + 2(2x - 4)
→ 3 + 4x - 8
Upon combining like terms:
3 + 4x - 8
→ 4x - 5
Th simplified expression of Zach’s equation would be:
→ 4x - 5
