Question

решите плез прошу !!!

Answer 1

1)n(n-3)-(n-4)(n-5)-4=n²-3n-n²+9n-20-4=6n-24=6(n-4)
2)(k-5)(k-7)+k(-k-2)=k²-12k+35-k²-2k=-14k+35=7(-2k+5)
3)(a-5)(a-7)-(a+1)(a-1)=a²-12a+35-a²+1=-12a+36=12(-a+3)