J's answer to Elizabeth Gonesco's Secondary 1 Maths question.
Try to expand the answer in d (work backwards) and you will get 9x^2 + 6xy +y^2 - 30x -10y +25
Trick here is to be able to factorise by grouping 3x and y together
Trick here is to be able to factorise by grouping 3x and y together
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