(Х+3)*(Х+2) = Х^2 + 2Х + 3Х + 6 = Х^2 + 5Х + 6
(4+y)*(1+y) = 4 + 4y + y + y^2 = y^2 + 5y + 4
(5+t)*(5+t) = 25 + 5t + 5t + t^2 = t^2 + 10t + 25
(k+3)*(k+3) = k^2 + 3k + 3k + 9 = k^2 + 6k + 9
(Х+3)*(Х+2) = Х^2 + 2Х + 3Х + 6 = Х^2 + 5Х + 6
(4+y)*(1+y) = 4 + 4y + y + y^2 = y^2 + 5y + 4
(5+t)*(5+t) = 25 + 5t + 5t + t^2 = t^2 + 10t + 25
(k+3)*(k+3) = k^2 + 3k + 3k + 9 = k^2 + 6k + 9