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Quadratics

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Question 100
a.

By completing the square, show that the roots of the equation

x2+kx−6=0 x^2 + kx - 6 = 0 x2+kx−6=0

are

x=−k2±k24+6 x = -\frac{k}{2} \pm \sqrt{\frac{k^2}{4} + 6} x=−2k​±4k2​+6​
[4]
b.

Hence find the exact roots of the equation x2+4x−6=0x^2 + 4x - 6 = 0x2+4x−6=0

[2]
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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