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a fost răspuns

Descompuneti in factori , aplicand formula a^2-b^2 = ( a+b)(a-b) .
1.( x+y+1)^2 -x^2
2.(3x+4y)^2-49a^2
3.(x^2+1)^2 -x^4
DAU COROANA !!! REPEDE !

Răspuns :

Renatemambouko
1.( x+y+1)²-x² =( x+y+1-x)( x+y+1+x)  =(y+1)(2x+y+1)
2.(3x+4y)²-49a² =(3x+4y-7a)(3x+4y+7a)
3.(x²+1)² -x⁴=(x²+1 -x²)(x²+1 +x²)=2x²+1

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