Asked by Timothy

Obtain the first four term in the expansion of (2x-3y)*15
Answered by Timothy
i need an answer
Answered by oobleck
They are, of course,
(2x)^15 + C(15,1) (2x)^14 (-3y) + C(15,2) (2x)^13 (-3y)^2 + C(15,3) (2x)^12 (-3y)^3
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