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2. jawabannya (a-2b)(4b+3)
3.x2+xy-yz+xz
x(x+y) -z (x+y)
(x-z)(x+y)
4 49-4a2 = (7)2 - (2a)2
(7+2a)(7-2a)
5. 4m2 + 12m + 9 - m2 - 4m + 4
3m2 + 8m +13