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12.B
14.A
15.B
semoga membaantu
= (1,2,3,4,5,6,7,8)-(3,4)
= {1,2,5,6,7,8}...opsi D
12. 32-3 = 15+17 - x
x = 32-29
x = 3.....opsi B
14. 4x² + 4xy - 5y² - 9x² + 3xy + 6y²
= -5x² + 7xy + y²....opsi A (kurang angka kuadrat di opsi A)
15. 2a + 3b - 5 + 6a - 4b + 9
= 8a - b + 4....opsi B