Annie tried to subtract two polynomials. Her work is shown below:
(k? + 2k - 13) - (-3k? + 9k +1)
= k? + 2k - 13+3k? +9k +1
Step 1
= (1+3)k? + (2 +9)k + (-13 +1)
Step 2
= 4k? + 118 - 12
Step 3
At which step did Annie make an error, if at all?
Choose 1 answer: