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= 4x pangkat 2 + 6x - 4
b. 6ac - 12a pangkat 2 - 2c pangkat 2 + 4ac
= 10ac - 12a pangkat 2 - 2c pangkat 2
c. 2y pangkat 2 + 6y - y - 3
= 2y pangkat 2 + 5y - 3
d. xz - 3z + 6x - 18