The equation
x2+kx+8=k x^2 + kx + 8 = k x2+kx+8=khas no real solutions for xxx.
Show that k k\,k satisfies k2+4k−32<0k^2 + 4k - 32 < 0k2+4k−32<0.
Hence find the set of possible values of kkk.
Practise Edexcel A Level Old Maths Algebra and Functions 1 with exam-style questions for A Level Old Maths. 19 questions, matched to the Edexcel A Level Old Maths (9371) specification and written in Unit exams C1, C2, C3 and C4 plus two applied units (e.g. S1 and M1) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.