What went wrong?
The mistake that occurred in the first box is that they did not distribute the negative properly. They were also subtracting numbers but then kept the numbers they had subtracted. Another mistake that they did was that in the second box the student foiled the equation when it should have been subtracted.
What they needed to do?
They needed to distribute the negative sign properly and then combine like terms, as shown on the picture below. This problem should not have involved multiplying it involved adding and subtracting only.
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