Question

X в квадрате - 2х - 3=0

Answer 1

х² - 2х - 3 = 0
D = 2² + 4 * 1 * 3 = 4 + 12 = 16
х₁ = 2 + 4 / 2 * 1 = 3
х₂ = 2 - 4 / 2 * 1 = -2 / 2 = -1