pleasee exercițiul 4.

Pleasee Exercițiul 4 class=

Răspuns :

c) la ce restrangi ca e un binom la patrat=(3x+2)²
a) (x-2)·[3x+(x-2)-5]=
    (x-2)·(4x-7)

b)2009·2008x-2009·2007
2009·(2008x-2007)

c)9x²+12x+4=x²+12x+36=x²+6x+6x+36=x·(x+6)+6·(x+6)=(x+6)²

d) 3²/4²-5²x²=(3/4)²-(5x)²=(3/4+5x)·(3/4-5x)
        Unde "/" e fractie