Rozłóż na czynniki a*(7x-y)-(7x-y)^2
p*(3r-2q)+n*(2q-3r)=
12am-20an-18bm+30bn=
źródło:
a*(7x-y)-(7x-y)^2=(7x-y)(a-(7x-y))=
=(7x-y)(a-7y+y) ,
p*(3r-2q)+n*(2q-3r)=p*(3r-2q)-n(3r-2q)
=(3r-2q)(p-n) ,
12am-20an-18bm+30bn=4a(3m-5n)-6b(3m-5n)=
=(3m-5n)(4a-6b)