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Quadratics

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Question 5

The equation x2+(n+1)x+(a+bn)=0x^2 + (n + 1)x + (a + bn) = 0x2+(n+1)x+(a+bn)=0, where a a\,a and b b\,b are constants, has two distinct real roots precisely when n<−7−215n<-7-2\sqrt{15}n<−7−215​ or n>−7+215n>-7+2\sqrt{15}n>−7+215​.

Find the values of a a\,a and bbb.

[7]
Markscheme

Quadratics Questions

  1. A Level
  2. /Maths
  3. /Quadratics

322 exam-style questions on Edexcel A Level Maths Quadratics, covering 2.1 Solving Quadratics, 2.2 Completing the Square, 2.3 Sketching Quadratic Graphs, 2.4 The Discriminant, and 2.5 Modelling with Quadratics. Each one has a worked solution and a mark scheme showing where the marks go.

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