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Theyounglion
a fost răspuns

Descomp in factori: (2x+5)²-(x-1)²

Răspuns :

4x²+20x+25-x²+2x-1
3x²+22x+24
 (2x+5)²-(x-1)²==(2x)²+2·2·5·x+5²-(x²-2x+1)=4x²+20x+25-x²+2x-1=3x²+22x+24