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(2x - 3) (4 - 3x)
= 2x (4 - 3x) - 3 (4 - 3x)
= 8x - 6x² - 12 + 9x
= -6x² + 17x - 12 (D)
Nomor 10 :
a = 3
U6 = 96
Sn = a.(rⁿ - 1) / (r - 1)