http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2006exams/pdf_doc/maths_06.pdf
Question 7c)
(c) (i) Write down the discriminant of 2x<SUP>2 +(k –2)x +8, where k is a constant.
dis = b^2-4ac
= (k-2)^2 - 4(2)(8)
= k^2- 4k - 60
(ii) Hence, or otherwise, find the values of k for which the...