SOLUTION: expand(y+3r)^3

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Question 994719: expand(y+3r)^3
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
expand(y+3r)^3
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Use Pascal's triangle --> coeff's are 1 3 3 1
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(y+3r)^3 = 1*y^3 + 3*y^2*(3r)^1 + 3*y*(3r)^2 + 1*(3r)^3
= y%5E3+%2B+9y%5E2r+%2B+27yr%5E2+%2B+27r%5E3