Question

ajutatima,multumesc!

Answer 1

a) x²-3x-4=x²--4x+x-4=x(x-4)+x-4=(x-4)(x+1)
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=x²-4-x-2=(x-2)(x+2)-(x+2)=(x+2)(x-2-1)=(x+2)(x-3)
i) x²-x-2=x²-2x+x-2=x(x-2)+x-2=(x-2)(x+1)