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2014-04-17T14:33:38+03:00
(2x + 5)(2x - 3) - (x - 2)(x - 3) - (x - 2)(x + 1)=
=4x
²-6x+10x-15-(x²-3x-2x+6)-(x²+x-2x-2)=
=4x²-4x-15-x²+5x-6-x²+x+2=
=2x²+2x-19
1 5 1
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2014-04-17T14:48:50+03:00
(2x+5) (2x-3) - (x-2)(x-3)-(x-2)(x+1)=
=(2x+5)(2x-3)-(x-2)(x-3+x+1)=
=(2x+5)(2x-3)-(x-2)²·2=
=4x²+10x-6x-15-(2x²-8x+8)=
=2x²+12x-23
2 3 2