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Quadratics

Quadratics

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Question 12

Prove that, for all values of xxx,

x2+4x+12>x+3 x^2 + 4x + 12 > x + 3 x2+4x+12>x+3

Hence find the minimum value of x2+4x+12−(x+3)x^2 + 4x + 12 - (x + 3)x2+4x+12−(x+3)

[5]
Markscheme

Quadratics Questions

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

211 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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