18 - (x - 5)(x - 4) = -2
-(x² - 9x + 20) + 20 = 0
9x - x² = 0
x(9 - x) = 0
x₁ = 0 x₂ = 9
ответ: {0; 9}
18 - (x - 5)(x - 4) = -2
-(x² - 9x + 20) + 20 = 0
9x - x² = 0
x(9 - x) = 0
x₁ = 0 x₂ = 9
ответ: {0; 9}
x1=(9-9)/2=0
x2=(9+9)/2=9