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seharusnya : 2x(x-2).
ket: x.x=x²
2)x²-25y²=(x-5y)(x+5y)
(benar)
ket: kali silang masing²
3)2x²+7x+3=(2x+1)(x+3). (benar)
ket: kalisilang masing²
(i) 2XPANGKAT2-4X=2X(-4)XPANGKAT3
(ii) XPANGKAT2-25YPANGKAT2=(-25)XPANGKAT2 YPANGKAT2
(iii) 2XPANGKAT2+7X+3=(2XPANGKAT2+3) (7X+)