Edexcel CP AS 2018 June — Question 2

Exam BoardEdexcel
ModuleCP AS (Core Pure AS)
Year2018
SessionJune
TopicRoots of polynomials

  1. The cubic equation
$$z ^ { 3 } - 3 z ^ { 2 } + z + 5 = 0$$ has roots \(\alpha , \beta\) and \(\gamma\).
Without solving the equation, find the cubic equation whose roots are ( \(2 \alpha + 1\) ), ( \(2 \beta + 1\) ) and ( \(2 \gamma + 1\) ), giving your answer in the form \(w ^ { 3 } + p w ^ { 2 } + q w + r = 0\), where \(p , q\) and \(r\) are integers to be found.
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