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Square root when changing the subject

Square root when changing the subject

Secondary 2
4 marks
TGM Original Questions

Given \(r=\dfrac{4a-b^2}{3c}\):

  1. find \(r\) when \(a=3,b=-3,c=2\)[2]
  2. express \(b\) in terms of \(a,c,r\).[2]

Solution:

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Answer:(a) \(r=\dfrac12\) (b) \(b=\pm\sqrt{4a-3cr}\).

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