use the binomial theorem to complete this expansion.
(3x + 2y)^4 = 81x^4 + 216x^3y + .....
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What is it that you are having troubles with? You have a formula .. all you have to do is plug it in..
If you know the Binomial Theorem, it's straight-forward.
Exactly where is your difficulty? Use the binomial theorem to complete this expansion: . . . . . . . . and crank it out.
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