(x^2-5x-7)^2-(x-3)*(x-2)=25

(x^2 - 5x - 7)^2 - (x^2 - 5x + 6) = 25Пусть  x^2 - 5x = t, тогда(t - 7)^2 - (t + 6) = 25t^2 - 14t + 49 - t - 6 - 25 = 0t^2 - 15t + 18 = 0D = 153t1 = (15 + 3√17)/2t2 = (15 - 3√17)/2Обратная заменаx^2 - 5x = (15 - 3√17)/2D = 55 - 6√17x1 = ( 5 - (55 - 6√17))/2x2 = ( 5 + (55 - 6√17))/2x^2 - 5x = (15 + 3√17)/2D = 55 + 6√17x1 = ( 5 - (55  + 6√17))/2x2 = ( 5 + (55 + 6√17))/2