Eric Nicholas K's answer to Kathy's Secondary 4 A Maths Singapore question.
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For the first question, typically when they ask for the coefficient of x^2 from some (a + bx)^n, we just need to expand the first three terms to get terms up to x^2.
For the second question, we can either spell out all the terms up to x^5 or just extract the terms in x^4 and x^5 using the general term (after all, the full expansion is just simply the sum of all the general terms; each and every term in the expansion is a general term).
For the second question, we can either spell out all the terms up to x^5 or just extract the terms in x^4 and x^5 using the general term (after all, the full expansion is just simply the sum of all the general terms; each and every term in the expansion is a general term).
Date Posted:
5 years ago
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