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URGENT!!!  Descompuneti in factori : 
a) (x-2)² - 4x²= 
b) x²+6x+9-y²= 
c) x³+x²-16x-16= 
d)2x²+x-1=



Răspuns :

a) (x-2-2x)(x-2+2x)=-(x+2)(3x-2)=(x+2)(2-3x)
c) x²(x+16)-(x+16)=(x+16)(x²-1)=(x+16)(x-1)(x+1)
d) x²+x²+x-1=x(x+1) +(x²-1)=x(x+1)+(x-1)(x+1)=(x+1)(x+x-1)=(x+1)(2x-1)
b)x(x+6)+(3-y)(3+y) aici cred ca ai gresit si daca da spune sa corectam