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contoh : (x+3)2 = x2+6x+9
2.selisih dua kuadrat
(x+y)(x-y)=x2+xy-y2
=x2-y2
3.ax2+bx+c dengan a=1
contoh : (x+3)(x+4)=x2+4x+3x+12
=x2+7x+12
4.ax2+bx+c dengan a | 1
contoh : 8x2+22x+15 = 8x2+10x+12x+15
=2x(4x+5) + 3(4x+5)
=(4x+5)(2x+3)