Răspuns:
Explicație pas cu pas:
a).(x-2)(x+4)=x²+4x-2x-8=x²+2x-8
b).(y+2)(1-x)=y-xy+2-2x
c).(x-5)(2-x)=2x-x²-10+5x=-x²+7x-10
d).(m-3)(m-1)=m²-m-3m+3=m²-4m+3
e).(a-5)(6-a)=6a-a²-30+5a=-a²+11a-30
f).(2x-1)(x-3)=2x²-6x-x+3=2x²-7x+3
g).(5-3x)(x-2)=5x-10-3x²-6x=-3x²-x-10
h).(3-2a)(2a-5)=6a-15-4a²+10a=-4a²+16a-15
