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a fost răspuns

a) (X-1)la a doua -16
b)9-(x+2)la a doua 
c) 9x la a doua -(2x-3) la a doua

Răspuns :

a) (x-1)²-16=(x-1-4)(x-1+4)=(x-5)(x+3);
b) 9-(x+2)²=(3-x-2)(3+x+2)=(1-x)(x+5);
c) 9x²-(2x-3)²=(3x-2x+3)(3x+2x-3)=(x+3)(5x-3)

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