1.
(x - x1)(x - x2) = 0
(x - 8)(x + 5) = 0
x² + 5x - 8x - 40 = 0
x² - 3x - 40 = 0
2.
теорема Виета
x² + px + q = 0
x1 + x2 = -p
x1*x2 = q
x1 + x2 = -5 + 8 = 3
x1*x2 = 8*(-5)= -4 0
1.
(x - x1)(x - x2) = 0
(x - 8)(x + 5) = 0
x² + 5x - 8x - 40 = 0
x² - 3x - 40 = 0
2.
теорема Виета
x² + px + q = 0
x1 + x2 = -p
x1*x2 = q
x1 + x2 = -5 + 8 = 3
x1*x2 = 8*(-5)= -4 0
x² - 3x - 40 = 0