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1. =x pangkat 2 dikurang 2x-4x+8= x(x-2)-4(x-2)= (x-4) (x-2)
2. = x pangkat 2 ditambah 4x+5x+20 = x(x+4) + 5(x+4) = (x+5) (x+4)
3. = p pangkat 2 dikurang 2p-6p+12= p(p-2)-6(p-2) = (p-6) (p-2)
4. = p pangkat 2 dikurang 2p-20+4= p(p-2)-2(p-2) = (p-2) (p-2) = (p-2) pangkat 2.
5. = a pangkat 2 +3a- 5a-15= a(a+3)-5(a+3)= (a-5) (a+3).