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Quadratics

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Question 122

The equation x2+(n+1)x+(3−3n)=0x^2 + (n + 1)x + (3 - 3n) = 0x2+(n+1)x+(3−3n)=0, where n n\,n is a constant.

Given that

n<−7−215orn>−7+215, n < -7 - 2\sqrt{15} \quad \text{or} \quad n > -7 + 2\sqrt{15}, n<−7−215​orn>−7+215​,

show that the equation has two distinct real roots.

[4]
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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