1) x1 = 4, x2 = -1; 2) y1 = 4, y2 = -7
Объяснение:
1) x^2-4x+x-4 = 0
x^2-3x-4 = 0
по т.Виета:
x1+x2 = 3
x1*x2 = -4
x1 = 4, x2 = -1
2) y^2+7y-4y-28 = 0
y^2+3y-28 = 0
y1+y2 = -3
y1*y2 = -28
y1 = 4, y2 = -7
