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a fost răspuns

Efectuati:a)3x(2x-1)+(x+2)(x-5),b)(x+4)(x-3)-(x-1)(x+6),c)5x(x-4)-(x-3)(5x+2),d)( 7x -1)(x-3)-5(x+2)(x+4).Va rog ajutati_ma!

Răspuns :

a)6x patrat -3x +x patrat -5x+2x-10= 7x patrat -10 
b) X patrat +4x-3x+12- x patrat -x-x+6 =-2x + 15 (x cu x se reduc )
c)5x patrat -20x - (5x patrat +2 x+15 x -6)= +5 x patrat -20x -5x patrat +17x -6 (5x cu 5x se reduc) =-3 x -6
7x patrat -21x -x-4 -5* (x patrat-10+2x+8)
7 x patrat -21x -x -4 - 5 x patrat -50+ 10x +40 =2 x patrat-10x -14 

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