(c-2b)(c+2b) преобразуйте в многочлен

pusti budet x i y storoni preamougolinovo

{2x+2y=26,x*y=36

{x+y=13,x*y=36

{x=13-y,(13-y)y=36

{x=13-y,13y-y^2=36

{x=13-y,y^2+13y-36=0

y^2+13y-36=0

d=169-4*1*(-36)=25

y1=-13-5/2=-9

y2=-13+5/2=4

{x=13-4=9,y=4

otvet: storoni preamougolinika rovni 4 cm i 9 cm