Oxford Mathematician Dr Tom Crawford sits the ‘Abitur Mathematik’ – the maths exam taken by students in Germany at the end of high school. The exam taken by Tom is the 2019 Abitur Mathematik from the German region of Bavaria. The paper is taken when leaving school at the age of 17 or 18. Don’t forget to test yourself with the accompanying Maple Learn worksheet here.
You can download the paper taken by Tom here.
And a version translated to English can be found here.

your a + b + c = 0 condition in the proof in the end is not sufficient in case d = 0.
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