P1 difficult questions in the past papers

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Are you struggling with P1 difficult questions in the past papers? In this video, we'll go over some challenging questions to help you prepare for your exams.
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for question 7, how does -(9+k)x become 81+18k+k^2? since the -1 is still multiplying with the whole equation.

Kefshee
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Um How many marks do we get in Q4(b) if we stopped at p=8 and 1/4 ?

Itsabbyy