Question

Oblicz:
x²-x-2=0
Z góry dzięki :)

Answer 1

Lub:
x² - x - 2 = 0
x² + x - 2x - 2 = 0
x(x + 1) - 2(x + 1) = 0
(x + 1)(x - 2) = 0
x = -1    v    x = 2
x ∈ {-1; 2}