AQA C1 2015 June — Question 8

Exam BoardAQA
ModuleC1 (Core Mathematics 1)
Year2015
SessionJune
TopicInequalities

8 A curve has equation \(y = x ^ { 2 } + ( 3 k - 4 ) x + 13\) and a line has equation \(y = 2 x + k\), where \(k\) is a constant.
  1. Show that the \(x\)-coordinate of any point of intersection of the line and curve satisfies the equation $$x ^ { 2 } + 3 ( k - 2 ) x + 13 - k = 0$$
  2. Given that the line and the curve do not intersect:
    1. show that \(9 k ^ { 2 } - 32 k - 16 < 0\);
    2. find the possible values of \(k\).
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