(х-2)² - 36х² = (х-2)² - (6х)² = (х-2-6х)(х-2+6х) = (-2-5х)*(7х-2) =
= -1*(2+5х)*(7х-2)
с²- d²- 7d - 7c = (с- d)( с+d) - 7(d - c ) = (с- d)( с+d -7 )
