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64t²-25 = (8t+5)(8t-5)
13)
2m²-10m = 2m(m-5)
14)
12a-6a² = 6a(2-a)
15)
4x²-9 / 12x+18
= (2x+3)(2x-3) / 6(2x+3)
= (2x-3)/6
atau
= 1/6 (2x-3)