разложите ** множ-ли: 1)5m^2-10mn+5n^2 2)20p-50-2p^2 2)-9x^2-6x-1

Question

разложите на множ-ли:

1)5m^2-10mn+5n^2

2)20p-50-2p^2

2)-9x^2-6x-1

Answer 1

5m^2-10mn+5n^2=5(m-n)^2

20p-50-2p^2=-2(p-5)^

-9x^2-6x-1=-(3x+1)