Here's Robert's work for a problem in which he needed to solve for x. His final step is Step 5, with the final answers being x = -3 and x = 3. In which step did he make an error? 1 X-2 4 Problem: x+1 X-3 (x + 1) (x – 3) Step 1: x- 3+ x2 – x– 2=4 Step 2: x2–5=4 Step 3: x2–9=0 Step 4: (x+3) (x – 3) =0 Step 5: x=-3, x=3 a) Robert did nothing wrong. B) Step 1 c) Step 3 d) Step 4 e) Step 5
