Joe incorrectly factored 5x^2 - 11x + 2 using the following steps:
STEP 1: 5x^2 + (-10x - x) +2
STEP 2: (5x^2 - 10x) + (x-2)
STEP 3: 5x (x-2) + 1 (x -2)
STEP 4: (5x +1) (x-2)
In which STEP did he make his error?
a) In STEP 1 because the -11x was rewritten as -10x -x
b) In STEP 2 because the sign on x should be negative and the sign on 2 should be positive
c) in STEP 3 because there is no need to multiply (x-2) by 1
d) in STEP 4 because (x-2) should be written first.