SOLUTION: What is the coefficient of x^2y^5 when (x-2y)^7 is expanded?

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Question 696781: What is the coefficient of x^2y^5 when (x-2y)^7 is expanded?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
What is the coefficient of x^2y^5 when (x-2y)^7 is expanded?
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Ans: 7C2*x^2*(-2y)^5 = 21*x^2*(-32y^5) = -672x^2y^5
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Cheers,
Stan H.
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