решить-
(Х+1)*(2+Х)-7=(4*7+2)*х+100

(х + 1) * (2 + х) - 7 = (4 *7 + 2)х + 1002х + x^2 + 2 + x - 7 = 30x + 100x^2 + 3x - 30x - 5 - 100 = 0x^2 - 27x - 105 = 0D = 729 - 4*(- 105) = 729 + 420 = 1149;  √D = приблизительно 33, 9х1 = (27 + 33,9) / 2 = 60,9 /2 = 30,45х2 = (27 - 33,9) / 2 = - 6,9/2 = - 3,45