| Exam Board | AQA |
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| Module | Further Paper 2 (Further Paper 2) |
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| Year | 2024 |
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| Session | June |
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| Topic | Roots of polynomials |
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4 The function f is a quartic function with real coefficients.
The complex number 5i is a root of the equation \(\mathrm { f } ( x ) = 0\)
Which one of the following must be a factor of \(\mathrm { f } ( x )\) ?
Circle your answer.
( \(x ^ { 2 } - 25\) )
\(\left( x ^ { 2 } - 5 \right)\)
\(\left( x ^ { 2 } + 5 \right)\)
\(\left( x ^ { 2 } + 25 \right)\)