Mathaddict100's answer to Kathy's Secondary 4 A Maths Singapore question.
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Qn 36
Date Posted:
5 years ago
for part i how you suddenly get 27
The (3-2x) is fixed.Since you are finding the x coefficient,I need to times 3 and -2x to the terms in the power 9 expression I have found.This is where I got 27bx-2x.27 is the end product of multiplying 3 and 9 together.
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