Ответ:

Пошаговое объяснение:

x^2 - 28x +171 = 0

D = -28^2 - 4*1*171=784-684=100. D=10

x1= (28+10)/2 = 16

x2 = (28-10)/2 = 9

x1+x2=16+9=25

x1*x2=16*9=144

x^2-8x-33=0

D=-8^2-4*1*(-33)=64+132=196. D = 14

x1= (8+14)/2 =11

x2 = (8-14)/2 = -3

x1+x2 = 11 + (-3) = 11-3 = 8

x1*x2 = 11 * (-3) = -33