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Descompuneti in factori:
a)121x²-49=
b)a³+8b³=
c)x²-9+(x - 3)²=​


Răspuns :

Răspuns:

a)121x²-49=(11x -7)(11x+7)

b)a³+8b³=( a+2b)(a^2- 2ab+4b^2)

c)x²-9+(x - 3)²= (x-3)(x+3)+(x-3)^2=

(x-3)(x+3+x-3)=(x-3)2x=2x(x-3)

folosim formulele de calcul

a^2-b^2=(a-b)(a+b)

a^3+b^3=(a+b)(a^2-ab+b^2)