Factorise the following: a) 2x2 - 4x + 2 b) x2 – 2x – 15 C) x3 – x2 – 16 x – 20 x2 - 4y2 1024 e) 24 24 Student Answer 6x 24x5 A18 F18 Assessor Feedback Satisfactory Not Satisfactory Q19 In an arc welding process, the current output is as l(t) = 2 - 4t +4, what is the time(s) in seconds when the current I is zero.