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1 =
1 2 1 =
1 3 3 1 =
1 4 6 4 1 =
berhubung yang dicari adalah cara panjang maka
(-2a+3b)⁴ =
(-2a+3b) * (-2a+3b)
(4a²-12ab+9b²) * (-2a+3b)
(-8a³+36a²b-54ab²+27b³) * (-2a+3b)