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Specialist Mathematics Β· Unit 3 Β· Further complex numbers Β· Factorisation of polynomials

Solve polynomial equations over β„‚ to order 4 including those with real and imaginary coefficients, e.g. solve 𝑧4 + 𝑧3 βˆ’ 𝑧2 + 𝑧 βˆ’ 2 = 0 and 𝑧3 βˆ’ 2𝑖 𝑧2 + 𝑧 βˆ’ 2𝑖 = 0.

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Question 1

A polynomial equation is given in the stimulus. Find all solutions to this equation over \(\mathbb{C}\).

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Question 2

Solve the polynomial equation \(z^3 - 3iz^2 - 3z + 9i = 0\) over \(\mathbb{C}\). Express your solutions in the form \(a + bi\) where \(a, b \in \mathbb{R}\).

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More in Factorisation of polynomials

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Apply the factor theorem and the remainder theorem for polynomials.
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Understand and use the complex conjugate root theorem for polynomials with real coefficients, e.g. factorise a cubic polynomial with real coefficients given one factor.
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