Question

Answer 1

Bài 7: 

a: =(x-2)(x-3)

b: =(x-1)(x-2)

Answer 2

7. 
a) x²-5x-6 (sửa đề)
= x²+x-6x-6
= x(x+1)-6(x+1)
= (x-6)(x+1)
b) x²-3x+2
= x²-x-2x+2
= x(x-1)-2(x-1)
= (x-2)(x-1)
c) x²-5x-14
= x²+2x-7x-14
= x(x+2)-7(x+2)
= (x-7)(x+2)
d) x²+6x+5
= x²+x+5x+5
= x(x+1)+5(x+1)
= (x+5)(x+1)