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Descompuneti in factori:

3x⁴+30x³+75x³
18ab²-12ab+2a
2x³-20x²+50x
5x²y²-20z²

Va rog cu explicatie, mai concret!​


Răspuns :

3x³(x+10+25)=3x³(x+35)

2a(9b²-6b+1)=2a(3b-1)²

2x(x²-10x+25)=2x(x-5)²

5(x²y²-4z²)=5(xy-2z)(xy+2z)

S-au folosit formulele :
(a-b)(a+b)=a²-b²
(a-b)²= a²-2ab+b²