Answer:
1) The error is 3x² - 3x - 18 = 3(x² - 3x - 18)
The 3 needs to be factorised out of each term in the brackets not just 3x² → the correction is 3x² - 3x - 18 = 3(x² - x - 6) → 3(x - 3)(x + 2)
2) The 5 and 1 are written in the wrong brackets; it should be (10x - 1)(x + 5)
Hope this helps!
