Question

ajutatima,multumesc!

Answer 1

11
a) x²-3x-4=(x²+x-4x-4)=x(x+1)-4(x+1)=(x+1)(x-4)
b)x²+4x-5=x²+5x-x-5=x(x+5)-(x+5)=(x+5)(x-1)
c)x²+2x-3=x²+3x-x-3=x(x+3)-(x+3)=(x+3)(x-1)
d) x²-6x-7=x²-7x+x-7=x(x-7)+(x-7)=(x-7)(x+1)
e)x²-8x-20=x²-10x+2x-20=x(x-10)+2(x-10)=(x-10)(x+2)
f)x²+7x-18=x²+9x-2x-18=x(x+9)-2(x+9)=(x+9)(x-2)
g)x²+x-2=x²+2x-x-2=x(x+2)-(x+2)=(x+2)(x-1)
h)x²-x-6=x²-3x+2x-6=x(x-3)+2(x-3)=(x-3)(x+2)
i)x²-x-2=x²-2x-x-2=x(x-2)+(x-2)=(x-2)(x+1)