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2023 YTSS P1 Q6
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2023 YTSS P1 Q6
Secondary 4
4 marks
Factorise \(27x^3+125\).
[2]
Explain why \(x=-\dfrac53\) is the only real root of the equation \(27x^3+125=0\).
[2]
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Answer:
(a) \((3x+5)(9x^2-15x+25)\). (b) The quadratic factor has discriminant \(-675<0\).
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