Question 1198732
Expand (2x+7y)^5.
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Use the coefficients from Pascal's triangle:
1  5 10 10 5  1
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{{{(2x)^5 + 5*(2x)^4*7y + 10*(2x)^3*(7y)^2 + 10*(2x)^2*(7y)^3 + 5*2x*(7y)^4 + (7y)^5}}}