Descompuneti in factori:
a) x^2+8x+15=
b) x^2+9x+14=
c) x^2-3x+2=
d) x^2-12x+35=
VA ROG AJUTATIMAAA, DAU COROANA


Răspuns :

a) (x+3)(x+5)
b) (x+7)(x+2)
c) (x-2)(x-1)
d) (x-7)(x-5)
x ²+8x+15=x²+3x+5x+15=x(x+3)+5(x+3)=(x+3) (x+5)
x²+9x+14=x²+2x+7x+14=x(x+2)+7(x+2)=(x+2) (x+7)
x²-3x+2=x²-x-2x+2=x(x-1) -2(x-1)=(x-1) (x-2)
x²-12 x +35=x²-5x-7x+35=x (x-5)-7(x-5)= (x-5) (x-7 )