1) 18-(x-5)(x-4)= -2
раскроем скобки
18-x2+4x+5x-20 = -2
-x2+9x = 0
x2-9x = 0
x(x – 9) = 0
x1 = 0
x – 9 = 0
x2 = 9
1) 18-(x-5)(x-4)= -2
раскроем скобки
18-x2+4x+5x-20 = -2
-x2+9x = 0
x2-9x = 0
x(x – 9) = 0
x1 = 0
x – 9 = 0
x2 = 9