Question

ex 7 d) va roog
Descompune in factori

Answer 1

a)x²-9x+14=x²-7x-2x+14=x(x-7)-2(x-7)=(x-7)(x-2)
b)x²-6x-16=x²-8x+2x-16=x(x-8)+2(x-8)=(x-8)(x+2)
c)4x²-(x-1)²=(2x-x+1)(2x+x-1)=(x+1)(3x-1)
d)x³+2x²-9x-18=x²(x+2)-9(x+2)=(x+2)(x²-9)=(x+2)(x-3)(x+3)
e)5x+15+xy+3y=5(x+3)+y(x+3)=(x+3)(y+5)
f)x²+11x+28=x²+4x+7x+28=x(x+4)+7(x+4)=(x+4)(x+7)
Sper ca te-am ajutat.