IB Math AA HL 2021 May TZ1 paper 1 full solution (Section B)

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If you need Section A:

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Wow, the grade boundary for a 7 was a 63%?

hitzcritz
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At 18:08, why is it (aˆ2+2a+1) and not (aˆ2+4a+4)? In the previous step we had (a+2)ˆ2 and not (a+1)ˆ2. Am I missing something?

oliversp