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Rebejaa7
a fost răspuns

Descompuneti in factori :)
Ajutatima va rog mult [tex] x^{2} +4xy+4y^{2} -9


(x-3) ^{2}+2(x-3)(x+2)+(x+2) ^{2}


x^{2} +2xy+y^{2} -z^{2} -2zt- t^{2}
[/tex]

Răspuns :

Spidie
x²+4xy+4y²-9= (x+2y)²-9= (x+2y+3)(x+2y-3)
(x-3)²+2(x-y)(x+2)+(x+2)²= [(x-3)+(x+2)]²= (x-3+x+2)²=(2x-1)(2x-1)
x²+2xy+y² -z²-2zt-t²=(x²+2xy+y²) - (z²+2zt+t²)=(x+y)²-(z+t)²=
=(x+y-z-t)(x+y+z+t)

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