NURUL FARHANA BINTE SALLEH's answer to ☃️'s Secondary 3 A Maths Singapore question.

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NURUL FARHANA BINTE SALLEH
Nurul Farhana Binte Salleh's answer
3 answers (Tutor Details)
1st
the statement 12-r-2r comes from the powers of x when you expand it in the statement prior to that.