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(a+b)^4
= a^{4} + 4a^{3}b +6a^{2}b^{2}+4ab^{3}+b^{4}
(2a - 3)^4
(2a)^{4} + 4(2a)^{3}(-3) + 6(2a)^{2}(-3)^{2} + 4(2a)(-3)^{3)+(-3)^{4}
16a^{4} - 96a^{3} + 216a^{2} - 216a + 81
maka koefisien pada sumu kedua adalah -96