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Coroana !!! Va rog frumos !!

Coroana Va Rog Frumos class=

Răspuns :

(5x-3)²-(3x-4)²=(5x-3-3x+4)(5x-3+3x-4)=(2x+1)(8x-7)

x²-2x-3=x²+x-3x-3=x(x+1)-3(x+1)=(x+1)(x-3)

x²-4x-12=x²+2x-6x-12=x(x+2)-6(x+2)=(x+2)(x-6)