
Arturo O. answered 12/16/19
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The coefficients are
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
The expansion is
(2x + 3)4 = (2x)4 + 4(2x)3(3) + 6(2x)2(3)2 + 4(2x)(3)3 + (3)4
You can simplify this further if you wish.