O-LevelAdditional MathematicsQuadratic functions4037/12 · May/June 2013 · Q44 Marks
Find the set of values of k for which the curve y = 2x² + kx + 2k – 6 lies above the x-axis for all values of x.
- Find the set of values of k for which the curve y = 2x² + kx + 2k – 6 lies above the x-axis for all values of x.[4]
Mark scheme
Marking points from the official mark scheme (May/June 2013). The mark or mark type is shown in brackets.
- [1] M1 for attempted use of b²
- [1] DM1 for attempt to obtain critic values from a 3 term quadratic
- [1] A1 for both critical values
- [1] A1 for correct final answer
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