A level Edexcel June 2022 Paper 1 Q2 - Factor theorem | ExamSolutions

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Factor theorem exam questions for Edexcel June 2022 Paper 1

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I multiply out the brackets and then solved for “K”. So different working but the same result: -17. However, if you replace K with -17 in the equation, you don’t get zero. Can you explain please? Much obliged, Mark

markdavis