Answer
The student multiplied 4.4 by 2 instead of raising it to the second power. The student also forgot to distribute the negative into the parenthesis, so the student added 3.1 instead of subtracting by 3.1.
Work Step by Step
The correct method is as follows:
$$ 4.4^2-(2.5+3.1) \\ 19.36-2.5-3.1 \\ 13.76$$
