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
One student is incorrect. Analyze their work to determine which students work is incorrect and describe the mistakes made.
Student 2's work is incorrect. The mistake was made when they subtracted 7 from 2 instead of multiplying. The correct calculation should be:
f(-1) = 2 + 7(-1)
f(-1) = 2 + (-7)
f(-1) = -5