1) -5x ( x-2 ) + ( x-3 ) ( x + 1 ) 2) 3a ( a+3 ) - ( 2 - a ) ( 3a- 4 )
-5x ( x-2 ) + ( x-3 ) ( x + 1 ) =-5x^2+10x+x^2-2x-3=-4x^2+8x-3
3a ( a+3 ) - ( 2 - a ) ( 3a- 4 )=3a^2+9a-6a+8+3a^2-4a=6a^2-a+8
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-5x ( x-2 ) + ( x-3 ) ( x + 1 ) =-5x^2+10x+x^2-2x-3=-4x^2+8x-3
3a ( a+3 ) - ( 2 - a ) ( 3a- 4 )=3a^2+9a-6a+8+3a^2-4a=6a^2-a+8
3а*2+6а-(6а-8-3а*2-4а)=3а*2+6а-6а+8+3а*2-4а=6а*2-4а+8
Надо ли решать через дискриминант?