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=m²+m-2
(2x+3)(x-8)=2x²-16x+3x-24
=2x²-13x-24
(3p-7)(p-3)=3p²-9p-7p+21
=3p²-16p+21
(3a²+1)(6+4a²)=18a²+12a^4(pangkat 4)+6+4a²
=12a^4(pangkat 4)+18a²+4a²+6
=12^4(pangkat 4)+22a²+6
(x+3)(x-3)=x²-3x+3x-9
=x²-9