Given that kkk is a positive constant,
on separate diagrams, sketch the graph with equation
(i) y=k−3∣x∣y = k - 3|x|y=k−3∣x∣
(ii) y=∣3x−k2∣y = \left| 3x - \frac{k}{2} \right|y=3x−2k
Show on each sketch the coordinates, in terms of kkk, of each point where the graph meets or cuts the axes.
Hence find, in terms of kkk, the values of xxx for which
∣3x−k2∣=k−3∣x∣\left| 3x - \frac{k}{2} \right| = k - 3|x|3x−2k=k−3∣x∣
giving your answers in simplest form.
Practise Edexcel A Level Maths 2.7 Solving Modulus Problems with exam-style questions for A Level Maths. 32 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 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.