Question

Rozwiąż równanie
A)x^2+2x
B)2x^2-18=0

Answer 1

A.
x² + 2x = 0
x(x + 2) = 0
x = 0
lub
x + 2 = 0
x = -2
x ∈ {-2; 0}


B.
2x² - 18 = 0    /:2
x² - 9 = 0
(x + 3)(x - 3) = 0
x+3 = 0
x = -3
lub
x - 3 = 0
x = 3
x ∈ {-3;3}