I understand Binomial Theorem, but this was an extension question and I can't find the answer. In the expansion of (1+bx)^n , the first three terms are 1-3x+(15/4)x^2. Find b and n. Could someone please help me? Thanks.
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. So the first three terms are: . Take it from there...
Write out the first three terms of the expansion and compare it to 1-3x+15x^2/4.
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