Question 3: Two students evaluated a function and their work is shown below. One student's work is incorrect. Analyze each student's work to determine which student made the error. Use the text box below to explain the mistake that was made.

Question

Function Rule:
f(x)= 2+7x

student 1:
f(-1)= 2 + 7(-1)
f(-1) = 9 (-1)
f(-1) = -9

student 2:
f(-1) = 2 + 7 (-1)
f(-1) = 2 - 7
f(-1) = -5

Answer 1

Student 1 made the error. In their work, they incorrectly multiplied 7 and -1 to get -9 instead of -7. The correct calculation would be 2 + 7 (-1) = 2 - 7 = -5, as shown in student 2's work.