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Substitution

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Question 49
a.

a=8a = 8a=8 b=−5b = -5b=−5 c=2c = 2c=2

Work out the value of b2−4acb^2 - 4acb2−4ac

[2]
b.

Hence work out the value of 4ac−b24ac - b^24ac−b2

[1]
Markscheme

Substitution Questions

  1. GCSE
  2. /Maths
  3. /Substitution

296 exam-style questions on WJEC GCSE Maths Substitution. Each one has a worked solution and a mark scheme showing where the marks go.

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